Api-roll 64: 2018-08-27
diff --git a/generated/googleapis/lib/serviceusage/v1.dart b/generated/googleapis/lib/serviceusage/v1.dart
new file mode 100644
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--- /dev/null
+++ b/generated/googleapis/lib/serviceusage/v1.dart
@@ -0,0 +1,5460 @@
+// This is a generated file (see the discoveryapis_generator project).
+
+// ignore_for_file: unnecessary_cast
+
+library googleapis.serviceusage.v1;
+
+import 'dart:core' as core;
+import 'dart:async' as async;
+import 'dart:convert' as convert;
+
+import 'package:_discoveryapis_commons/_discoveryapis_commons.dart' as commons;
+import 'package:http/http.dart' as http_1;
+
+export 'package:_discoveryapis_commons/_discoveryapis_commons.dart'
+    show ApiRequestError, DetailedApiRequestError;
+
+const core.String USER_AGENT = 'dart-api-client serviceusage/v1';
+
+/// Enables services that service consumers want to use on Google Cloud
+/// Platform, lists the available or enabled services, or disables services that
+/// service consumers no longer use.
+class ServiceusageApi {
+  /// View and manage your data across Google Cloud Platform services
+  static const CloudPlatformScope =
+      "https://www.googleapis.com/auth/cloud-platform";
+
+  /// View your data across Google Cloud Platform services
+  static const CloudPlatformReadOnlyScope =
+      "https://www.googleapis.com/auth/cloud-platform.read-only";
+
+  /// Manage your Google API service configuration
+  static const ServiceManagementScope =
+      "https://www.googleapis.com/auth/service.management";
+
+  final commons.ApiRequester _requester;
+
+  OperationsResourceApi get operations => new OperationsResourceApi(_requester);
+  ServicesResourceApi get services => new ServicesResourceApi(_requester);
+
+  ServiceusageApi(http_1.Client client,
+      {core.String rootUrl: "https://serviceusage.googleapis.com/",
+      core.String servicePath: ""})
+      : _requester =
+            new commons.ApiRequester(client, rootUrl, servicePath, USER_AGENT);
+}
+
+class OperationsResourceApi {
+  final commons.ApiRequester _requester;
+
+  OperationsResourceApi(commons.ApiRequester client) : _requester = client;
+
+  /// Starts asynchronous cancellation on a long-running operation.  The server
+  /// makes a best effort to cancel the operation, but success is not
+  /// guaranteed.  If the server doesn't support this method, it returns
+  /// `google.rpc.Code.UNIMPLEMENTED`.  Clients can use
+  /// Operations.GetOperation or
+  /// other methods to check whether the cancellation succeeded or whether the
+  /// operation completed despite cancellation. On successful cancellation,
+  /// the operation is not deleted; instead, it becomes an operation with
+  /// an Operation.error value with a google.rpc.Status.code of 1,
+  /// corresponding to `Code.CANCELLED`.
+  ///
+  /// [request] - The metadata request object.
+  ///
+  /// Request parameters:
+  ///
+  /// [name] - The name of the operation resource to be cancelled.
+  /// Value must have pattern "^operations/.+$".
+  ///
+  /// [$fields] - Selector specifying which fields to include in a partial
+  /// response.
+  ///
+  /// Completes with a [Empty].
+  ///
+  /// Completes with a [commons.ApiRequestError] if the API endpoint returned an
+  /// error.
+  ///
+  /// If the used [http_1.Client] completes with an error when making a REST
+  /// call, this method will complete with the same error.
+  async.Future<Empty> cancel(CancelOperationRequest request, core.String name,
+      {core.String $fields}) {
+    var _url = null;
+    var _queryParams = new core.Map<core.String, core.List<core.String>>();
+    var _uploadMedia = null;
+    var _uploadOptions = null;
+    var _downloadOptions = commons.DownloadOptions.Metadata;
+    var _body = null;
+
+    if (request != null) {
+      _body = convert.json.encode((request).toJson());
+    }
+    if (name == null) {
+      throw new core.ArgumentError("Parameter name is required.");
+    }
+    if ($fields != null) {
+      _queryParams["fields"] = [$fields];
+    }
+
+    _url = 'v1/' + commons.Escaper.ecapeVariableReserved('$name') + ':cancel';
+
+    var _response = _requester.request(_url, "POST",
+        body: _body,
+        queryParams: _queryParams,
+        uploadOptions: _uploadOptions,
+        uploadMedia: _uploadMedia,
+        downloadOptions: _downloadOptions);
+    return _response.then((data) => new Empty.fromJson(data));
+  }
+
+  /// Deletes a long-running operation. This method indicates that the client is
+  /// no longer interested in the operation result. It does not cancel the
+  /// operation. If the server doesn't support this method, it returns
+  /// `google.rpc.Code.UNIMPLEMENTED`.
+  ///
+  /// Request parameters:
+  ///
+  /// [name] - The name of the operation resource to be deleted.
+  /// Value must have pattern "^operations/.+$".
+  ///
+  /// [$fields] - Selector specifying which fields to include in a partial
+  /// response.
+  ///
+  /// Completes with a [Empty].
+  ///
+  /// Completes with a [commons.ApiRequestError] if the API endpoint returned an
+  /// error.
+  ///
+  /// If the used [http_1.Client] completes with an error when making a REST
+  /// call, this method will complete with the same error.
+  async.Future<Empty> delete(core.String name, {core.String $fields}) {
+    var _url = null;
+    var _queryParams = new core.Map<core.String, core.List<core.String>>();
+    var _uploadMedia = null;
+    var _uploadOptions = null;
+    var _downloadOptions = commons.DownloadOptions.Metadata;
+    var _body = null;
+
+    if (name == null) {
+      throw new core.ArgumentError("Parameter name is required.");
+    }
+    if ($fields != null) {
+      _queryParams["fields"] = [$fields];
+    }
+
+    _url = 'v1/' + commons.Escaper.ecapeVariableReserved('$name');
+
+    var _response = _requester.request(_url, "DELETE",
+        body: _body,
+        queryParams: _queryParams,
+        uploadOptions: _uploadOptions,
+        uploadMedia: _uploadMedia,
+        downloadOptions: _downloadOptions);
+    return _response.then((data) => new Empty.fromJson(data));
+  }
+
+  /// Gets the latest state of a long-running operation.  Clients can use this
+  /// method to poll the operation result at intervals as recommended by the API
+  /// service.
+  ///
+  /// Request parameters:
+  ///
+  /// [name] - The name of the operation resource.
+  /// Value must have pattern "^operations/[^/]+$".
+  ///
+  /// [$fields] - Selector specifying which fields to include in a partial
+  /// response.
+  ///
+  /// Completes with a [Operation].
+  ///
+  /// Completes with a [commons.ApiRequestError] if the API endpoint returned an
+  /// error.
+  ///
+  /// If the used [http_1.Client] completes with an error when making a REST
+  /// call, this method will complete with the same error.
+  async.Future<Operation> get(core.String name, {core.String $fields}) {
+    var _url = null;
+    var _queryParams = new core.Map<core.String, core.List<core.String>>();
+    var _uploadMedia = null;
+    var _uploadOptions = null;
+    var _downloadOptions = commons.DownloadOptions.Metadata;
+    var _body = null;
+
+    if (name == null) {
+      throw new core.ArgumentError("Parameter name is required.");
+    }
+    if ($fields != null) {
+      _queryParams["fields"] = [$fields];
+    }
+
+    _url = 'v1/' + commons.Escaper.ecapeVariableReserved('$name');
+
+    var _response = _requester.request(_url, "GET",
+        body: _body,
+        queryParams: _queryParams,
+        uploadOptions: _uploadOptions,
+        uploadMedia: _uploadMedia,
+        downloadOptions: _downloadOptions);
+    return _response.then((data) => new Operation.fromJson(data));
+  }
+
+  /// Lists operations that match the specified filter in the request. If the
+  /// server doesn't support this method, it returns `UNIMPLEMENTED`.
+  ///
+  /// NOTE: the `name` binding allows API services to override the binding
+  /// to use different resource name schemes, such as `users / * /operations`.
+  /// To
+  /// override the binding, API services can add a binding such as
+  /// `"/v1/{name=users / * }/operations"` to their service configuration.
+  /// For backwards compatibility, the default name includes the operations
+  /// collection id, however overriding users must ensure the name binding
+  /// is the parent resource, without the operations collection id.
+  ///
+  /// Request parameters:
+  ///
+  /// [filter] - The standard list filter.
+  ///
+  /// [name] - The name of the operation's parent resource.
+  ///
+  /// [pageToken] - The standard list page token.
+  ///
+  /// [pageSize] - The standard list page size.
+  ///
+  /// [$fields] - Selector specifying which fields to include in a partial
+  /// response.
+  ///
+  /// Completes with a [ListOperationsResponse].
+  ///
+  /// Completes with a [commons.ApiRequestError] if the API endpoint returned an
+  /// error.
+  ///
+  /// If the used [http_1.Client] completes with an error when making a REST
+  /// call, this method will complete with the same error.
+  async.Future<ListOperationsResponse> list(
+      {core.String filter,
+      core.String name,
+      core.String pageToken,
+      core.int pageSize,
+      core.String $fields}) {
+    var _url = null;
+    var _queryParams = new core.Map<core.String, core.List<core.String>>();
+    var _uploadMedia = null;
+    var _uploadOptions = null;
+    var _downloadOptions = commons.DownloadOptions.Metadata;
+    var _body = null;
+
+    if (filter != null) {
+      _queryParams["filter"] = [filter];
+    }
+    if (name != null) {
+      _queryParams["name"] = [name];
+    }
+    if (pageToken != null) {
+      _queryParams["pageToken"] = [pageToken];
+    }
+    if (pageSize != null) {
+      _queryParams["pageSize"] = ["${pageSize}"];
+    }
+    if ($fields != null) {
+      _queryParams["fields"] = [$fields];
+    }
+
+    _url = 'v1/operations';
+
+    var _response = _requester.request(_url, "GET",
+        body: _body,
+        queryParams: _queryParams,
+        uploadOptions: _uploadOptions,
+        uploadMedia: _uploadMedia,
+        downloadOptions: _downloadOptions);
+    return _response.then((data) => new ListOperationsResponse.fromJson(data));
+  }
+}
+
+class ServicesResourceApi {
+  final commons.ApiRequester _requester;
+
+  ServicesResourceApi(commons.ApiRequester client) : _requester = client;
+
+  /// Enable multiple services on a project. The operation is atomic: if
+  /// enabling
+  /// any service fails, then the entire batch fails, and no state changes
+  /// occur.
+  ///
+  /// Operation<response: BatchEnableServicesResponse>
+  ///
+  /// [request] - The metadata request object.
+  ///
+  /// Request parameters:
+  ///
+  /// [parent] - Parent to enable services on.
+  ///
+  /// An example name would be:
+  /// `projects/123`
+  /// where `123` is the project number (not project ID).
+  ///
+  /// The `BatchEnableServices` method currently only supports projects.
+  /// Value must have pattern "^[^/]+/[^/]+$".
+  ///
+  /// [$fields] - Selector specifying which fields to include in a partial
+  /// response.
+  ///
+  /// Completes with a [Operation].
+  ///
+  /// Completes with a [commons.ApiRequestError] if the API endpoint returned an
+  /// error.
+  ///
+  /// If the used [http_1.Client] completes with an error when making a REST
+  /// call, this method will complete with the same error.
+  async.Future<Operation> batchEnable(
+      BatchEnableServicesRequest request, core.String parent,
+      {core.String $fields}) {
+    var _url = null;
+    var _queryParams = new core.Map<core.String, core.List<core.String>>();
+    var _uploadMedia = null;
+    var _uploadOptions = null;
+    var _downloadOptions = commons.DownloadOptions.Metadata;
+    var _body = null;
+
+    if (request != null) {
+      _body = convert.json.encode((request).toJson());
+    }
+    if (parent == null) {
+      throw new core.ArgumentError("Parameter parent is required.");
+    }
+    if ($fields != null) {
+      _queryParams["fields"] = [$fields];
+    }
+
+    _url = 'v1/' +
+        commons.Escaper.ecapeVariableReserved('$parent') +
+        '/services:batchEnable';
+
+    var _response = _requester.request(_url, "POST",
+        body: _body,
+        queryParams: _queryParams,
+        uploadOptions: _uploadOptions,
+        uploadMedia: _uploadMedia,
+        downloadOptions: _downloadOptions);
+    return _response.then((data) => new Operation.fromJson(data));
+  }
+
+  /// Disable a service so that it can no longer be used with a project.
+  /// This prevents unintended usage that may cause unexpected billing
+  /// charges or security leaks.
+  ///
+  /// It is not valid to call the disable method on a service that is not
+  /// currently enabled. Callers will receive a `FAILED_PRECONDITION` status if
+  /// the target service is not currently enabled.
+  ///
+  /// Operation<response: DisableServiceResponse>
+  ///
+  /// [request] - The metadata request object.
+  ///
+  /// Request parameters:
+  ///
+  /// [name] - Name of the consumer and service to disable the service on.
+  ///
+  /// The enable and disable methods currently only support projects.
+  ///
+  /// An example name would be:
+  /// `projects/123/services/serviceusage.googleapis.com`
+  /// where `123` is the project number (not project ID).
+  /// Value must have pattern "^[^/]+/[^/]+/services/[^/]+$".
+  ///
+  /// [$fields] - Selector specifying which fields to include in a partial
+  /// response.
+  ///
+  /// Completes with a [Operation].
+  ///
+  /// Completes with a [commons.ApiRequestError] if the API endpoint returned an
+  /// error.
+  ///
+  /// If the used [http_1.Client] completes with an error when making a REST
+  /// call, this method will complete with the same error.
+  async.Future<Operation> disable(
+      DisableServiceRequest request, core.String name,
+      {core.String $fields}) {
+    var _url = null;
+    var _queryParams = new core.Map<core.String, core.List<core.String>>();
+    var _uploadMedia = null;
+    var _uploadOptions = null;
+    var _downloadOptions = commons.DownloadOptions.Metadata;
+    var _body = null;
+
+    if (request != null) {
+      _body = convert.json.encode((request).toJson());
+    }
+    if (name == null) {
+      throw new core.ArgumentError("Parameter name is required.");
+    }
+    if ($fields != null) {
+      _queryParams["fields"] = [$fields];
+    }
+
+    _url = 'v1/' + commons.Escaper.ecapeVariableReserved('$name') + ':disable';
+
+    var _response = _requester.request(_url, "POST",
+        body: _body,
+        queryParams: _queryParams,
+        uploadOptions: _uploadOptions,
+        uploadMedia: _uploadMedia,
+        downloadOptions: _downloadOptions);
+    return _response.then((data) => new Operation.fromJson(data));
+  }
+
+  /// Enable a service so that it can be used with a project.
+  ///
+  /// Operation<response: EnableServiceResponse>
+  ///
+  /// [request] - The metadata request object.
+  ///
+  /// Request parameters:
+  ///
+  /// [name] - Name of the consumer and service to enable the service on.
+  ///
+  /// The `EnableService` and `DisableService` methods currently only support
+  /// projects.
+  ///
+  /// Enabling a service requires that the service is public or is shared with
+  /// the user enabling the service.
+  ///
+  /// An example name would be:
+  /// `projects/123/services/serviceusage.googleapis.com`
+  /// where `123` is the project number (not project ID).
+  /// Value must have pattern "^[^/]+/[^/]+/services/[^/]+$".
+  ///
+  /// [$fields] - Selector specifying which fields to include in a partial
+  /// response.
+  ///
+  /// Completes with a [Operation].
+  ///
+  /// Completes with a [commons.ApiRequestError] if the API endpoint returned an
+  /// error.
+  ///
+  /// If the used [http_1.Client] completes with an error when making a REST
+  /// call, this method will complete with the same error.
+  async.Future<Operation> enable(EnableServiceRequest request, core.String name,
+      {core.String $fields}) {
+    var _url = null;
+    var _queryParams = new core.Map<core.String, core.List<core.String>>();
+    var _uploadMedia = null;
+    var _uploadOptions = null;
+    var _downloadOptions = commons.DownloadOptions.Metadata;
+    var _body = null;
+
+    if (request != null) {
+      _body = convert.json.encode((request).toJson());
+    }
+    if (name == null) {
+      throw new core.ArgumentError("Parameter name is required.");
+    }
+    if ($fields != null) {
+      _queryParams["fields"] = [$fields];
+    }
+
+    _url = 'v1/' + commons.Escaper.ecapeVariableReserved('$name') + ':enable';
+
+    var _response = _requester.request(_url, "POST",
+        body: _body,
+        queryParams: _queryParams,
+        uploadOptions: _uploadOptions,
+        uploadMedia: _uploadMedia,
+        downloadOptions: _downloadOptions);
+    return _response.then((data) => new Operation.fromJson(data));
+  }
+
+  /// Returns the service configuration and enabled state for a given service.
+  ///
+  /// Request parameters:
+  ///
+  /// [name] - Name of the consumer and service to get the `ConsumerState` for.
+  ///
+  /// An example name would be:
+  /// `projects/123/services/serviceusage.googleapis.com`
+  /// where `123` is the project number (not project ID).
+  /// Value must have pattern "^[^/]+/[^/]+/services/[^/]+$".
+  ///
+  /// [$fields] - Selector specifying which fields to include in a partial
+  /// response.
+  ///
+  /// Completes with a [GoogleApiServiceusageV1Service].
+  ///
+  /// Completes with a [commons.ApiRequestError] if the API endpoint returned an
+  /// error.
+  ///
+  /// If the used [http_1.Client] completes with an error when making a REST
+  /// call, this method will complete with the same error.
+  async.Future<GoogleApiServiceusageV1Service> get(core.String name,
+      {core.String $fields}) {
+    var _url = null;
+    var _queryParams = new core.Map<core.String, core.List<core.String>>();
+    var _uploadMedia = null;
+    var _uploadOptions = null;
+    var _downloadOptions = commons.DownloadOptions.Metadata;
+    var _body = null;
+
+    if (name == null) {
+      throw new core.ArgumentError("Parameter name is required.");
+    }
+    if ($fields != null) {
+      _queryParams["fields"] = [$fields];
+    }
+
+    _url = 'v1/' + commons.Escaper.ecapeVariableReserved('$name');
+
+    var _response = _requester.request(_url, "GET",
+        body: _body,
+        queryParams: _queryParams,
+        uploadOptions: _uploadOptions,
+        uploadMedia: _uploadMedia,
+        downloadOptions: _downloadOptions);
+    return _response
+        .then((data) => new GoogleApiServiceusageV1Service.fromJson(data));
+  }
+
+  /// List all services available to the specified project, and the current
+  /// state of those services with respect to the project. The list includes
+  /// all public services, all services for which the calling user has the
+  /// `servicemanagement.services.bind` permission, and all services that have
+  /// already been enabled on the project. The list can be filtered to
+  /// only include services in a specific state, for example to only include
+  /// services enabled on the project.
+  ///
+  /// Request parameters:
+  ///
+  /// [parent] - Parent to search for services on.
+  ///
+  /// An example name would be:
+  /// `projects/123`
+  /// where `123` is the project number (not project ID).
+  /// Value must have pattern "^[^/]+/[^/]+$".
+  ///
+  /// [pageToken] - Token identifying which result to start with, which is
+  /// returned by a
+  /// previous list call.
+  ///
+  /// [pageSize] - Requested size of the next page of data.
+  /// Requested page size cannot exceed 200.
+  ///  If not set, the default page size is 50.
+  ///
+  /// [filter] - Only list services that conform to the given filter.
+  /// The allowed filter strings are `state:ENABLED` and `state:DISABLED`.
+  ///
+  /// [$fields] - Selector specifying which fields to include in a partial
+  /// response.
+  ///
+  /// Completes with a [ListServicesResponse].
+  ///
+  /// Completes with a [commons.ApiRequestError] if the API endpoint returned an
+  /// error.
+  ///
+  /// If the used [http_1.Client] completes with an error when making a REST
+  /// call, this method will complete with the same error.
+  async.Future<ListServicesResponse> list(core.String parent,
+      {core.String pageToken,
+      core.int pageSize,
+      core.String filter,
+      core.String $fields}) {
+    var _url = null;
+    var _queryParams = new core.Map<core.String, core.List<core.String>>();
+    var _uploadMedia = null;
+    var _uploadOptions = null;
+    var _downloadOptions = commons.DownloadOptions.Metadata;
+    var _body = null;
+
+    if (parent == null) {
+      throw new core.ArgumentError("Parameter parent is required.");
+    }
+    if (pageToken != null) {
+      _queryParams["pageToken"] = [pageToken];
+    }
+    if (pageSize != null) {
+      _queryParams["pageSize"] = ["${pageSize}"];
+    }
+    if (filter != null) {
+      _queryParams["filter"] = [filter];
+    }
+    if ($fields != null) {
+      _queryParams["fields"] = [$fields];
+    }
+
+    _url =
+        'v1/' + commons.Escaper.ecapeVariableReserved('$parent') + '/services';
+
+    var _response = _requester.request(_url, "GET",
+        body: _body,
+        queryParams: _queryParams,
+        uploadOptions: _uploadOptions,
+        uploadMedia: _uploadMedia,
+        downloadOptions: _downloadOptions);
+    return _response.then((data) => new ListServicesResponse.fromJson(data));
+  }
+}
+
+/// Api is a light-weight descriptor for an API Interface.
+///
+/// Interfaces are also described as "protocol buffer services" in some
+/// contexts,
+/// such as by the "service" keyword in a .proto file, but they are different
+/// from API Services, which represent a concrete implementation of an interface
+/// as opposed to simply a description of methods and bindings. They are also
+/// sometimes simply referred to as "APIs" in other contexts, such as the name
+/// of
+/// this message itself. See https://cloud.google.com/apis/design/glossary for
+/// detailed terminology.
+class Api {
+  /// The methods of this interface, in unspecified order.
+  core.List<Method> methods;
+
+  /// Included interfaces. See Mixin.
+  core.List<Mixin> mixins;
+
+  /// The fully qualified name of this interface, including package name
+  /// followed by the interface's simple name.
+  core.String name;
+
+  /// Any metadata attached to the interface.
+  core.List<Option> options;
+
+  /// Source context for the protocol buffer service represented by this
+  /// message.
+  SourceContext sourceContext;
+
+  /// The source syntax of the service.
+  /// Possible string values are:
+  /// - "SYNTAX_PROTO2" : Syntax `proto2`.
+  /// - "SYNTAX_PROTO3" : Syntax `proto3`.
+  core.String syntax;
+
+  /// A version string for this interface. If specified, must have the form
+  /// `major-version.minor-version`, as in `1.10`. If the minor version is
+  /// omitted, it defaults to zero. If the entire version field is empty, the
+  /// major version is derived from the package name, as outlined below. If the
+  /// field is not empty, the version in the package name will be verified to be
+  /// consistent with what is provided here.
+  ///
+  /// The versioning schema uses [semantic
+  /// versioning](http://semver.org) where the major version number
+  /// indicates a breaking change and the minor version an additive,
+  /// non-breaking change. Both version numbers are signals to users
+  /// what to expect from different versions, and should be carefully
+  /// chosen based on the product plan.
+  ///
+  /// The major version is also reflected in the package name of the
+  /// interface, which must end in `v<major-version>`, as in
+  /// `google.feature.v1`. For major versions 0 and 1, the suffix can
+  /// be omitted. Zero major versions must only be used for
+  /// experimental, non-GA interfaces.
+  core.String version;
+
+  Api();
+
+  Api.fromJson(core.Map _json) {
+    if (_json.containsKey("methods")) {
+      methods = (_json["methods"] as core.List)
+          .map<Method>((value) => new Method.fromJson(value))
+          .toList();
+    }
+    if (_json.containsKey("mixins")) {
+      mixins = (_json["mixins"] as core.List)
+          .map<Mixin>((value) => new Mixin.fromJson(value))
+          .toList();
+    }
+    if (_json.containsKey("name")) {
+      name = _json["name"];
+    }
+    if (_json.containsKey("options")) {
+      options = (_json["options"] as core.List)
+          .map<Option>((value) => new Option.fromJson(value))
+          .toList();
+    }
+    if (_json.containsKey("sourceContext")) {
+      sourceContext = new SourceContext.fromJson(_json["sourceContext"]);
+    }
+    if (_json.containsKey("syntax")) {
+      syntax = _json["syntax"];
+    }
+    if (_json.containsKey("version")) {
+      version = _json["version"];
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (methods != null) {
+      _json["methods"] = methods.map((value) => (value).toJson()).toList();
+    }
+    if (mixins != null) {
+      _json["mixins"] = mixins.map((value) => (value).toJson()).toList();
+    }
+    if (name != null) {
+      _json["name"] = name;
+    }
+    if (options != null) {
+      _json["options"] = options.map((value) => (value).toJson()).toList();
+    }
+    if (sourceContext != null) {
+      _json["sourceContext"] = (sourceContext).toJson();
+    }
+    if (syntax != null) {
+      _json["syntax"] = syntax;
+    }
+    if (version != null) {
+      _json["version"] = version;
+    }
+    return _json;
+  }
+}
+
+/// Configuration for an anthentication provider, including support for
+/// [JSON Web Token
+/// (JWT)](https://tools.ietf.org/html/draft-ietf-oauth-json-web-token-32).
+class AuthProvider {
+  /// The list of JWT
+  /// [audiences](https://tools.ietf.org/html/draft-ietf-oauth-json-web-token-32#section-4.1.3).
+  /// that are allowed to access. A JWT containing any of these audiences will
+  /// be accepted. When this setting is absent, only JWTs with audience
+  /// "https://Service_name/API_name"
+  /// will be accepted. For example, if no audiences are in the setting,
+  /// LibraryService API will only accept JWTs with the following audience
+  /// "https://library-example.googleapis.com/google.example.library.v1.LibraryService".
+  ///
+  /// Example:
+  ///
+  ///     audiences: bookstore_android.apps.googleusercontent.com,
+  ///                bookstore_web.apps.googleusercontent.com
+  core.String audiences;
+
+  /// Redirect URL if JWT token is required but no present or is expired.
+  /// Implement authorizationUrl of securityDefinitions in OpenAPI spec.
+  core.String authorizationUrl;
+
+  /// The unique identifier of the auth provider. It will be referred to by
+  /// `AuthRequirement.provider_id`.
+  ///
+  /// Example: "bookstore_auth".
+  core.String id;
+
+  /// Identifies the principal that issued the JWT. See
+  /// https://tools.ietf.org/html/draft-ietf-oauth-json-web-token-32#section-4.1.1
+  /// Usually a URL or an email address.
+  ///
+  /// Example: https://securetoken.google.com
+  /// Example: 1234567-compute@developer.gserviceaccount.com
+  core.String issuer;
+
+  /// URL of the provider's public key set to validate signature of the JWT. See
+  /// [OpenID
+  /// Discovery](https://openid.net/specs/openid-connect-discovery-1_0.html#ProviderMetadata).
+  /// Optional if the key set document:
+  ///  - can be retrieved from
+  /// [OpenID
+  /// Discovery](https://openid.net/specs/openid-connect-discovery-1_0.html
+  ///    of the issuer.
+  /// - can be inferred from the email domain of the issuer (e.g. a Google
+  /// service account).
+  ///
+  /// Example: https://www.googleapis.com/oauth2/v1/certs
+  core.String jwksUri;
+
+  AuthProvider();
+
+  AuthProvider.fromJson(core.Map _json) {
+    if (_json.containsKey("audiences")) {
+      audiences = _json["audiences"];
+    }
+    if (_json.containsKey("authorizationUrl")) {
+      authorizationUrl = _json["authorizationUrl"];
+    }
+    if (_json.containsKey("id")) {
+      id = _json["id"];
+    }
+    if (_json.containsKey("issuer")) {
+      issuer = _json["issuer"];
+    }
+    if (_json.containsKey("jwksUri")) {
+      jwksUri = _json["jwksUri"];
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (audiences != null) {
+      _json["audiences"] = audiences;
+    }
+    if (authorizationUrl != null) {
+      _json["authorizationUrl"] = authorizationUrl;
+    }
+    if (id != null) {
+      _json["id"] = id;
+    }
+    if (issuer != null) {
+      _json["issuer"] = issuer;
+    }
+    if (jwksUri != null) {
+      _json["jwksUri"] = jwksUri;
+    }
+    return _json;
+  }
+}
+
+/// User-defined authentication requirements, including support for
+/// [JSON Web Token
+/// (JWT)](https://tools.ietf.org/html/draft-ietf-oauth-json-web-token-32).
+class AuthRequirement {
+  /// NOTE: This will be deprecated soon, once AuthProvider.audiences is
+  /// implemented and accepted in all the runtime components.
+  ///
+  /// The list of JWT
+  /// [audiences](https://tools.ietf.org/html/draft-ietf-oauth-json-web-token-32#section-4.1.3).
+  /// that are allowed to access. A JWT containing any of these audiences will
+  /// be accepted. When this setting is absent, only JWTs with audience
+  /// "https://Service_name/API_name"
+  /// will be accepted. For example, if no audiences are in the setting,
+  /// LibraryService API will only accept JWTs with the following audience
+  /// "https://library-example.googleapis.com/google.example.library.v1.LibraryService".
+  ///
+  /// Example:
+  ///
+  ///     audiences: bookstore_android.apps.googleusercontent.com,
+  ///                bookstore_web.apps.googleusercontent.com
+  core.String audiences;
+
+  /// id from authentication provider.
+  ///
+  /// Example:
+  ///
+  ///     provider_id: bookstore_auth
+  core.String providerId;
+
+  AuthRequirement();
+
+  AuthRequirement.fromJson(core.Map _json) {
+    if (_json.containsKey("audiences")) {
+      audiences = _json["audiences"];
+    }
+    if (_json.containsKey("providerId")) {
+      providerId = _json["providerId"];
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (audiences != null) {
+      _json["audiences"] = audiences;
+    }
+    if (providerId != null) {
+      _json["providerId"] = providerId;
+    }
+    return _json;
+  }
+}
+
+/// `Authentication` defines the authentication configuration for an API.
+///
+/// Example for an API targeted for external use:
+///
+///     name: calendar.googleapis.com
+///     authentication:
+///       providers:
+///       - id: google_calendar_auth
+///         jwks_uri: https://www.googleapis.com/oauth2/v1/certs
+///         issuer: https://securetoken.google.com
+///       rules:
+///       - selector: "*"
+///         requirements:
+///           provider_id: google_calendar_auth
+class Authentication {
+  /// Defines a set of authentication providers that a service supports.
+  core.List<AuthProvider> providers;
+
+  /// A list of authentication rules that apply to individual API methods.
+  ///
+  /// **NOTE:** All service configuration rules follow "last one wins" order.
+  core.List<AuthenticationRule> rules;
+
+  Authentication();
+
+  Authentication.fromJson(core.Map _json) {
+    if (_json.containsKey("providers")) {
+      providers = (_json["providers"] as core.List)
+          .map<AuthProvider>((value) => new AuthProvider.fromJson(value))
+          .toList();
+    }
+    if (_json.containsKey("rules")) {
+      rules = (_json["rules"] as core.List)
+          .map<AuthenticationRule>(
+              (value) => new AuthenticationRule.fromJson(value))
+          .toList();
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (providers != null) {
+      _json["providers"] = providers.map((value) => (value).toJson()).toList();
+    }
+    if (rules != null) {
+      _json["rules"] = rules.map((value) => (value).toJson()).toList();
+    }
+    return _json;
+  }
+}
+
+/// Authentication rules for the service.
+///
+/// By default, if a method has any authentication requirements, every request
+/// must include a valid credential matching one of the requirements.
+/// It's an error to include more than one kind of credential in a single
+/// request.
+///
+/// If a method doesn't have any auth requirements, request credentials will be
+/// ignored.
+class AuthenticationRule {
+  /// If true, the service accepts API keys without any other credential.
+  core.bool allowWithoutCredential;
+
+  /// The requirements for OAuth credentials.
+  OAuthRequirements oauth;
+
+  /// Requirements for additional authentication providers.
+  core.List<AuthRequirement> requirements;
+
+  /// Selects the methods to which this rule applies.
+  ///
+  /// Refer to selector for syntax details.
+  core.String selector;
+
+  AuthenticationRule();
+
+  AuthenticationRule.fromJson(core.Map _json) {
+    if (_json.containsKey("allowWithoutCredential")) {
+      allowWithoutCredential = _json["allowWithoutCredential"];
+    }
+    if (_json.containsKey("oauth")) {
+      oauth = new OAuthRequirements.fromJson(_json["oauth"]);
+    }
+    if (_json.containsKey("requirements")) {
+      requirements = (_json["requirements"] as core.List)
+          .map<AuthRequirement>((value) => new AuthRequirement.fromJson(value))
+          .toList();
+    }
+    if (_json.containsKey("selector")) {
+      selector = _json["selector"];
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (allowWithoutCredential != null) {
+      _json["allowWithoutCredential"] = allowWithoutCredential;
+    }
+    if (oauth != null) {
+      _json["oauth"] = (oauth).toJson();
+    }
+    if (requirements != null) {
+      _json["requirements"] =
+          requirements.map((value) => (value).toJson()).toList();
+    }
+    if (selector != null) {
+      _json["selector"] = selector;
+    }
+    return _json;
+  }
+}
+
+/// Configuration of authorization.
+///
+/// This section determines the authorization provider, if unspecified, then no
+/// authorization check will be done.
+///
+/// Example:
+///
+///     experimental:
+///       authorization:
+///         provider: firebaserules.googleapis.com
+class AuthorizationConfig {
+  /// The name of the authorization provider, such as
+  /// firebaserules.googleapis.com.
+  core.String provider;
+
+  AuthorizationConfig();
+
+  AuthorizationConfig.fromJson(core.Map _json) {
+    if (_json.containsKey("provider")) {
+      provider = _json["provider"];
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (provider != null) {
+      _json["provider"] = provider;
+    }
+    return _json;
+  }
+}
+
+/// Authorization rule for API services.
+///
+/// It specifies the permission(s) required for an API element for the overall
+/// API request to succeed. It is typically used to mark request message fields
+/// that contain the name of the resource and indicates the permissions that
+/// will be checked on that resource.
+///
+/// For example:
+///
+///     package google.storage.v1;
+///
+///     message CopyObjectRequest {
+///       string source = 1 [
+///         (google.api.authz).permissions = "storage.objects.get"];
+///
+///       string destination = 2 [
+///         (google.api.authz).permissions =
+///             "storage.objects.create,storage.objects.update"];
+///     }
+class AuthorizationRule {
+  /// The required permissions. The acceptable values vary depend on the
+  /// authorization system used. For Google APIs, it should be a comma-separated
+  /// Google IAM permission values. When multiple permissions are listed, the
+  /// semantics is not defined by the system. Additional documentation must
+  /// be provided manually.
+  core.String permissions;
+
+  /// Selects the API elements to which this rule applies.
+  ///
+  /// Refer to selector for syntax details.
+  core.String selector;
+
+  AuthorizationRule();
+
+  AuthorizationRule.fromJson(core.Map _json) {
+    if (_json.containsKey("permissions")) {
+      permissions = _json["permissions"];
+    }
+    if (_json.containsKey("selector")) {
+      selector = _json["selector"];
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (permissions != null) {
+      _json["permissions"] = permissions;
+    }
+    if (selector != null) {
+      _json["selector"] = selector;
+    }
+    return _json;
+  }
+}
+
+/// `Backend` defines the backend configuration for a service.
+class Backend {
+  /// A list of API backend rules that apply to individual API methods.
+  ///
+  /// **NOTE:** All service configuration rules follow "last one wins" order.
+  core.List<BackendRule> rules;
+
+  Backend();
+
+  Backend.fromJson(core.Map _json) {
+    if (_json.containsKey("rules")) {
+      rules = (_json["rules"] as core.List)
+          .map<BackendRule>((value) => new BackendRule.fromJson(value))
+          .toList();
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (rules != null) {
+      _json["rules"] = rules.map((value) => (value).toJson()).toList();
+    }
+    return _json;
+  }
+}
+
+/// A backend rule provides configuration for an individual API element.
+class BackendRule {
+  /// The address of the API backend.
+  core.String address;
+
+  /// The number of seconds to wait for a response from a request.  The default
+  /// deadline for gRPC is infinite (no deadline) and HTTP requests is 5
+  /// seconds.
+  core.double deadline;
+
+  /// Minimum deadline in seconds needed for this method. Calls having deadline
+  /// value lower than this will be rejected.
+  core.double minDeadline;
+
+  /// Selects the methods to which this rule applies.
+  ///
+  /// Refer to selector for syntax details.
+  core.String selector;
+
+  BackendRule();
+
+  BackendRule.fromJson(core.Map _json) {
+    if (_json.containsKey("address")) {
+      address = _json["address"];
+    }
+    if (_json.containsKey("deadline")) {
+      deadline = _json["deadline"].toDouble();
+    }
+    if (_json.containsKey("minDeadline")) {
+      minDeadline = _json["minDeadline"].toDouble();
+    }
+    if (_json.containsKey("selector")) {
+      selector = _json["selector"];
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (address != null) {
+      _json["address"] = address;
+    }
+    if (deadline != null) {
+      _json["deadline"] = deadline;
+    }
+    if (minDeadline != null) {
+      _json["minDeadline"] = minDeadline;
+    }
+    if (selector != null) {
+      _json["selector"] = selector;
+    }
+    return _json;
+  }
+}
+
+/// Request message for the `BatchEnableServices` method.
+class BatchEnableServicesRequest {
+  /// The identifiers of the services to enable on the project.
+  ///
+  /// A valid identifier would be:
+  /// serviceusage.googleapis.com
+  ///
+  /// Enabling services requires that each service is public or is shared with
+  /// the user enabling the service.
+  ///
+  /// Two or more services must be specified. To enable a single service,
+  /// use the `EnableService` method instead.
+  ///
+  /// A single request can enable a maximum of 20 services at a time. If more
+  /// than 20 services are specified, the request will fail, and no state
+  /// changes
+  /// will occur.
+  core.List<core.String> serviceIds;
+
+  BatchEnableServicesRequest();
+
+  BatchEnableServicesRequest.fromJson(core.Map _json) {
+    if (_json.containsKey("serviceIds")) {
+      serviceIds = (_json["serviceIds"] as core.List).cast<core.String>();
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (serviceIds != null) {
+      _json["serviceIds"] = serviceIds;
+    }
+    return _json;
+  }
+}
+
+/// Response message for the `BatchEnableServices` method.
+/// This response message is assigned to the `response` field of the returned
+/// Operation when that operation is done.
+class BatchEnableServicesResponse {
+  /// If allow_partial_success is true, and one or more services could not be
+  /// enabled, this field contains the details about each failure.
+  core.List<EnableFailure> failures;
+
+  /// The new state of the services after enabling.
+  core.List<GoogleApiServiceusageV1Service> services;
+
+  BatchEnableServicesResponse();
+
+  BatchEnableServicesResponse.fromJson(core.Map _json) {
+    if (_json.containsKey("failures")) {
+      failures = (_json["failures"] as core.List)
+          .map<EnableFailure>((value) => new EnableFailure.fromJson(value))
+          .toList();
+    }
+    if (_json.containsKey("services")) {
+      services = (_json["services"] as core.List)
+          .map<GoogleApiServiceusageV1Service>(
+              (value) => new GoogleApiServiceusageV1Service.fromJson(value))
+          .toList();
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (failures != null) {
+      _json["failures"] = failures.map((value) => (value).toJson()).toList();
+    }
+    if (services != null) {
+      _json["services"] = services.map((value) => (value).toJson()).toList();
+    }
+    return _json;
+  }
+}
+
+/// Billing related configuration of the service.
+///
+/// The following example shows how to configure monitored resources and metrics
+/// for billing:
+///
+///     monitored_resources:
+///     - type: library.googleapis.com/branch
+///       labels:
+///       - key: /city
+///         description: The city where the library branch is located in.
+///       - key: /name
+///         description: The name of the branch.
+///     metrics:
+///     - name: library.googleapis.com/book/borrowed_count
+///       metric_kind: DELTA
+///       value_type: INT64
+///     billing:
+///       consumer_destinations:
+///       - monitored_resource: library.googleapis.com/branch
+///         metrics:
+///         - library.googleapis.com/book/borrowed_count
+class Billing {
+  /// Billing configurations for sending metrics to the consumer project.
+  /// There can be multiple consumer destinations per service, each one must
+  /// have
+  /// a different monitored resource type. A metric can be used in at most
+  /// one consumer destination.
+  core.List<BillingDestination> consumerDestinations;
+
+  Billing();
+
+  Billing.fromJson(core.Map _json) {
+    if (_json.containsKey("consumerDestinations")) {
+      consumerDestinations = (_json["consumerDestinations"] as core.List)
+          .map<BillingDestination>(
+              (value) => new BillingDestination.fromJson(value))
+          .toList();
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (consumerDestinations != null) {
+      _json["consumerDestinations"] =
+          consumerDestinations.map((value) => (value).toJson()).toList();
+    }
+    return _json;
+  }
+}
+
+/// Configuration of a specific billing destination (Currently only support
+/// bill against consumer project).
+class BillingDestination {
+  /// Names of the metrics to report to this billing destination.
+  /// Each name must be defined in Service.metrics section.
+  core.List<core.String> metrics;
+
+  /// The monitored resource type. The type must be defined in
+  /// Service.monitored_resources section.
+  core.String monitoredResource;
+
+  BillingDestination();
+
+  BillingDestination.fromJson(core.Map _json) {
+    if (_json.containsKey("metrics")) {
+      metrics = (_json["metrics"] as core.List).cast<core.String>();
+    }
+    if (_json.containsKey("monitoredResource")) {
+      monitoredResource = _json["monitoredResource"];
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (metrics != null) {
+      _json["metrics"] = metrics;
+    }
+    if (monitoredResource != null) {
+      _json["monitoredResource"] = monitoredResource;
+    }
+    return _json;
+  }
+}
+
+/// The request message for Operations.CancelOperation.
+class CancelOperationRequest {
+  CancelOperationRequest();
+
+  CancelOperationRequest.fromJson(core.Map _json) {}
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    return _json;
+  }
+}
+
+/// `Context` defines which contexts an API requests.
+///
+/// Example:
+///
+///     context:
+///       rules:
+///       - selector: "*"
+///         requested:
+///         - google.rpc.context.ProjectContext
+///         - google.rpc.context.OriginContext
+///
+/// The above specifies that all methods in the API request
+/// `google.rpc.context.ProjectContext` and
+/// `google.rpc.context.OriginContext`.
+///
+/// Available context types are defined in package
+/// `google.rpc.context`.
+///
+/// This also provides mechanism to whitelist any protobuf message extension
+/// that
+/// can be sent in grpc metadata using “x-goog-ext-<extension_id>-bin” and
+/// “x-goog-ext-<extension_id>-jspb” format. For example, list any service
+/// specific protobuf types that can appear in grpc metadata as follows in your
+/// yaml file:
+///
+/// Example:
+///
+///     context:
+///       rules:
+///        - selector: "google.example.library.v1.LibraryService.CreateBook"
+///          allowed_request_extensions:
+///          - google.foo.v1.NewExtension
+///          allowed_response_extensions:
+///          - google.foo.v1.NewExtension
+///
+/// You can also specify extension ID instead of fully qualified extension name
+/// here.
+class Context {
+  /// A list of RPC context rules that apply to individual API methods.
+  ///
+  /// **NOTE:** All service configuration rules follow "last one wins" order.
+  core.List<ContextRule> rules;
+
+  Context();
+
+  Context.fromJson(core.Map _json) {
+    if (_json.containsKey("rules")) {
+      rules = (_json["rules"] as core.List)
+          .map<ContextRule>((value) => new ContextRule.fromJson(value))
+          .toList();
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (rules != null) {
+      _json["rules"] = rules.map((value) => (value).toJson()).toList();
+    }
+    return _json;
+  }
+}
+
+/// A context rule provides information about the context for an individual API
+/// element.
+class ContextRule {
+  /// A list of full type names or extension IDs of extensions allowed in grpc
+  /// side channel from client to backend.
+  core.List<core.String> allowedRequestExtensions;
+
+  /// A list of full type names or extension IDs of extensions allowed in grpc
+  /// side channel from backend to client.
+  core.List<core.String> allowedResponseExtensions;
+
+  /// A list of full type names of provided contexts.
+  core.List<core.String> provided;
+
+  /// A list of full type names of requested contexts.
+  core.List<core.String> requested;
+
+  /// Selects the methods to which this rule applies.
+  ///
+  /// Refer to selector for syntax details.
+  core.String selector;
+
+  ContextRule();
+
+  ContextRule.fromJson(core.Map _json) {
+    if (_json.containsKey("allowedRequestExtensions")) {
+      allowedRequestExtensions =
+          (_json["allowedRequestExtensions"] as core.List).cast<core.String>();
+    }
+    if (_json.containsKey("allowedResponseExtensions")) {
+      allowedResponseExtensions =
+          (_json["allowedResponseExtensions"] as core.List).cast<core.String>();
+    }
+    if (_json.containsKey("provided")) {
+      provided = (_json["provided"] as core.List).cast<core.String>();
+    }
+    if (_json.containsKey("requested")) {
+      requested = (_json["requested"] as core.List).cast<core.String>();
+    }
+    if (_json.containsKey("selector")) {
+      selector = _json["selector"];
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (allowedRequestExtensions != null) {
+      _json["allowedRequestExtensions"] = allowedRequestExtensions;
+    }
+    if (allowedResponseExtensions != null) {
+      _json["allowedResponseExtensions"] = allowedResponseExtensions;
+    }
+    if (provided != null) {
+      _json["provided"] = provided;
+    }
+    if (requested != null) {
+      _json["requested"] = requested;
+    }
+    if (selector != null) {
+      _json["selector"] = selector;
+    }
+    return _json;
+  }
+}
+
+/// Selects and configures the service controller used by the service.  The
+/// service controller handles features like abuse, quota, billing, logging,
+/// monitoring, etc.
+class Control {
+  /// The service control environment to use. If empty, no control plane
+  /// feature (like quota and billing) will be enabled.
+  core.String environment;
+
+  Control();
+
+  Control.fromJson(core.Map _json) {
+    if (_json.containsKey("environment")) {
+      environment = _json["environment"];
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (environment != null) {
+      _json["environment"] = environment;
+    }
+    return _json;
+  }
+}
+
+/// Customize service error responses.  For example, list any service
+/// specific protobuf types that can appear in error detail lists of
+/// error responses.
+///
+/// Example:
+///
+///     custom_error:
+///       types:
+///       - google.foo.v1.CustomError
+///       - google.foo.v1.AnotherError
+class CustomError {
+  /// The list of custom error rules that apply to individual API messages.
+  ///
+  /// **NOTE:** All service configuration rules follow "last one wins" order.
+  core.List<CustomErrorRule> rules;
+
+  /// The list of custom error detail types, e.g. 'google.foo.v1.CustomError'.
+  core.List<core.String> types;
+
+  CustomError();
+
+  CustomError.fromJson(core.Map _json) {
+    if (_json.containsKey("rules")) {
+      rules = (_json["rules"] as core.List)
+          .map<CustomErrorRule>((value) => new CustomErrorRule.fromJson(value))
+          .toList();
+    }
+    if (_json.containsKey("types")) {
+      types = (_json["types"] as core.List).cast<core.String>();
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (rules != null) {
+      _json["rules"] = rules.map((value) => (value).toJson()).toList();
+    }
+    if (types != null) {
+      _json["types"] = types;
+    }
+    return _json;
+  }
+}
+
+/// A custom error rule.
+class CustomErrorRule {
+  /// Mark this message as possible payload in error response.  Otherwise,
+  /// objects of this type will be filtered when they appear in error payload.
+  core.bool isErrorType;
+
+  /// Selects messages to which this rule applies.
+  ///
+  /// Refer to selector for syntax details.
+  core.String selector;
+
+  CustomErrorRule();
+
+  CustomErrorRule.fromJson(core.Map _json) {
+    if (_json.containsKey("isErrorType")) {
+      isErrorType = _json["isErrorType"];
+    }
+    if (_json.containsKey("selector")) {
+      selector = _json["selector"];
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (isErrorType != null) {
+      _json["isErrorType"] = isErrorType;
+    }
+    if (selector != null) {
+      _json["selector"] = selector;
+    }
+    return _json;
+  }
+}
+
+/// A custom pattern is used for defining custom HTTP verb.
+class CustomHttpPattern {
+  /// The name of this custom HTTP verb.
+  core.String kind;
+
+  /// The path matched by this custom verb.
+  core.String path;
+
+  CustomHttpPattern();
+
+  CustomHttpPattern.fromJson(core.Map _json) {
+    if (_json.containsKey("kind")) {
+      kind = _json["kind"];
+    }
+    if (_json.containsKey("path")) {
+      path = _json["path"];
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (kind != null) {
+      _json["kind"] = kind;
+    }
+    if (path != null) {
+      _json["path"] = path;
+    }
+    return _json;
+  }
+}
+
+/// Request message for the `DisableService` method.
+class DisableServiceRequest {
+  /// Indicates if services that are enabled and which depend on this service
+  /// should also be disabled. If not set, an error will be generated if any
+  /// enabled services depend on the service to be disabled. When set, the
+  /// service, and any enabled services that depend on it, will be disabled
+  /// together.
+  core.bool disableDependentServices;
+
+  DisableServiceRequest();
+
+  DisableServiceRequest.fromJson(core.Map _json) {
+    if (_json.containsKey("disableDependentServices")) {
+      disableDependentServices = _json["disableDependentServices"];
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (disableDependentServices != null) {
+      _json["disableDependentServices"] = disableDependentServices;
+    }
+    return _json;
+  }
+}
+
+/// Response message for the `DisableService` method.
+/// This response message is assigned to the `response` field of the returned
+/// Operation when that operation is done.
+class DisableServiceResponse {
+  /// The new state of the service after disabling.
+  GoogleApiServiceusageV1Service service;
+
+  DisableServiceResponse();
+
+  DisableServiceResponse.fromJson(core.Map _json) {
+    if (_json.containsKey("service")) {
+      service = new GoogleApiServiceusageV1Service.fromJson(_json["service"]);
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (service != null) {
+      _json["service"] = (service).toJson();
+    }
+    return _json;
+  }
+}
+
+/// `Documentation` provides the information for describing a service.
+///
+/// Example:
+/// <pre><code>documentation:
+///   summary: >
+///     The Google Calendar API gives access
+///     to most calendar features.
+///   pages:
+///   - name: Overview
+///     content: &#40;== include google/foo/overview.md ==&#41;
+///   - name: Tutorial
+///     content: &#40;== include google/foo/tutorial.md ==&#41;
+///     subpages;
+///     - name: Java
+///       content: &#40;== include google/foo/tutorial_java.md ==&#41;
+///   rules:
+///   - selector: google.calendar.Calendar.Get
+///     description: >
+///       ...
+///   - selector: google.calendar.Calendar.Put
+///     description: >
+///       ...
+/// </code></pre>
+/// Documentation is provided in markdown syntax. In addition to
+/// standard markdown features, definition lists, tables and fenced
+/// code blocks are supported. Section headers can be provided and are
+/// interpreted relative to the section nesting of the context where
+/// a documentation fragment is embedded.
+///
+/// Documentation from the IDL is merged with documentation defined
+/// via the config at normalization time, where documentation provided
+/// by config rules overrides IDL provided.
+///
+/// A number of constructs specific to the API platform are supported
+/// in documentation text.
+///
+/// In order to reference a proto element, the following
+/// notation can be used:
+/// <pre><code>&#91;fully.qualified.proto.name]&#91;]</code></pre>
+/// To override the display text used for the link, this can be used:
+/// <pre><code>&#91;display text]&#91;fully.qualified.proto.name]</code></pre>
+/// Text can be excluded from doc using the following notation:
+/// <pre><code>&#40;-- internal comment --&#41;</code></pre>
+///
+/// A few directives are available in documentation. Note that
+/// directives must appear on a single line to be properly
+/// identified. The `include` directive includes a markdown file from
+/// an external source:
+/// <pre><code>&#40;== include path/to/file ==&#41;</code></pre>
+/// The `resource_for` directive marks a message to be the resource of
+/// a collection in REST view. If it is not specified, tools attempt
+/// to infer the resource from the operations in a collection:
+/// <pre><code>&#40;== resource_for v1.shelves.books ==&#41;</code></pre>
+/// The directive `suppress_warning` does not directly affect documentation
+/// and is documented together with service config validation.
+class Documentation {
+  /// The URL to the root of documentation.
+  core.String documentationRootUrl;
+
+  /// Declares a single overview page. For example:
+  /// <pre><code>documentation:
+  ///   summary: ...
+  ///   overview: &#40;== include overview.md ==&#41;
+  /// </code></pre>
+  /// This is a shortcut for the following declaration (using pages style):
+  /// <pre><code>documentation:
+  ///   summary: ...
+  ///   pages:
+  ///   - name: Overview
+  ///     content: &#40;== include overview.md ==&#41;
+  /// </code></pre>
+  /// Note: you cannot specify both `overview` field and `pages` field.
+  core.String overview;
+
+  /// The top level pages for the documentation set.
+  core.List<Page> pages;
+
+  /// A list of documentation rules that apply to individual API elements.
+  ///
+  /// **NOTE:** All service configuration rules follow "last one wins" order.
+  core.List<DocumentationRule> rules;
+
+  /// A short summary of what the service does. Can only be provided by
+  /// plain text.
+  core.String summary;
+
+  Documentation();
+
+  Documentation.fromJson(core.Map _json) {
+    if (_json.containsKey("documentationRootUrl")) {
+      documentationRootUrl = _json["documentationRootUrl"];
+    }
+    if (_json.containsKey("overview")) {
+      overview = _json["overview"];
+    }
+    if (_json.containsKey("pages")) {
+      pages = (_json["pages"] as core.List)
+          .map<Page>((value) => new Page.fromJson(value))
+          .toList();
+    }
+    if (_json.containsKey("rules")) {
+      rules = (_json["rules"] as core.List)
+          .map<DocumentationRule>(
+              (value) => new DocumentationRule.fromJson(value))
+          .toList();
+    }
+    if (_json.containsKey("summary")) {
+      summary = _json["summary"];
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (documentationRootUrl != null) {
+      _json["documentationRootUrl"] = documentationRootUrl;
+    }
+    if (overview != null) {
+      _json["overview"] = overview;
+    }
+    if (pages != null) {
+      _json["pages"] = pages.map((value) => (value).toJson()).toList();
+    }
+    if (rules != null) {
+      _json["rules"] = rules.map((value) => (value).toJson()).toList();
+    }
+    if (summary != null) {
+      _json["summary"] = summary;
+    }
+    return _json;
+  }
+}
+
+/// A documentation rule provides information about individual API elements.
+class DocumentationRule {
+  /// Deprecation description of the selected element(s). It can be provided if
+  /// an
+  /// element is marked as `deprecated`.
+  core.String deprecationDescription;
+
+  /// Description of the selected API(s).
+  core.String description;
+
+  /// The selector is a comma-separated list of patterns. Each pattern is a
+  /// qualified name of the element which may end in "*", indicating a wildcard.
+  /// Wildcards are only allowed at the end and for a whole component of the
+  /// qualified name, i.e. "foo.*" is ok, but not "foo.b*" or "foo.*.bar". To
+  /// specify a default for all applicable elements, the whole pattern "*"
+  /// is used.
+  core.String selector;
+
+  DocumentationRule();
+
+  DocumentationRule.fromJson(core.Map _json) {
+    if (_json.containsKey("deprecationDescription")) {
+      deprecationDescription = _json["deprecationDescription"];
+    }
+    if (_json.containsKey("description")) {
+      description = _json["description"];
+    }
+    if (_json.containsKey("selector")) {
+      selector = _json["selector"];
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (deprecationDescription != null) {
+      _json["deprecationDescription"] = deprecationDescription;
+    }
+    if (description != null) {
+      _json["description"] = description;
+    }
+    if (selector != null) {
+      _json["selector"] = selector;
+    }
+    return _json;
+  }
+}
+
+/// A generic empty message that you can re-use to avoid defining duplicated
+/// empty messages in your APIs. A typical example is to use it as the request
+/// or the response type of an API method. For instance:
+///
+///     service Foo {
+///       rpc Bar(google.protobuf.Empty) returns (google.protobuf.Empty);
+///     }
+///
+/// The JSON representation for `Empty` is empty JSON object `{}`.
+class Empty {
+  Empty();
+
+  Empty.fromJson(core.Map _json) {}
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    return _json;
+  }
+}
+
+/// Provides error messages for the failing services.
+class EnableFailure {
+  /// An error message describing why the service could not be enabled.
+  core.String errorMessage;
+
+  /// The service id of a service that could not be enabled.
+  core.String serviceId;
+
+  EnableFailure();
+
+  EnableFailure.fromJson(core.Map _json) {
+    if (_json.containsKey("errorMessage")) {
+      errorMessage = _json["errorMessage"];
+    }
+    if (_json.containsKey("serviceId")) {
+      serviceId = _json["serviceId"];
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (errorMessage != null) {
+      _json["errorMessage"] = errorMessage;
+    }
+    if (serviceId != null) {
+      _json["serviceId"] = serviceId;
+    }
+    return _json;
+  }
+}
+
+/// Request message for the `EnableService` method.
+class EnableServiceRequest {
+  EnableServiceRequest();
+
+  EnableServiceRequest.fromJson(core.Map _json) {}
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    return _json;
+  }
+}
+
+/// Response message for the `EnableService` method.
+/// This response message is assigned to the `response` field of the returned
+/// Operation when that operation is done.
+class EnableServiceResponse {
+  /// The new state of the service after enabling.
+  GoogleApiServiceusageV1Service service;
+
+  EnableServiceResponse();
+
+  EnableServiceResponse.fromJson(core.Map _json) {
+    if (_json.containsKey("service")) {
+      service = new GoogleApiServiceusageV1Service.fromJson(_json["service"]);
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (service != null) {
+      _json["service"] = (service).toJson();
+    }
+    return _json;
+  }
+}
+
+/// `Endpoint` describes a network endpoint that serves a set of APIs.
+/// A service may expose any number of endpoints, and all endpoints share the
+/// same service configuration, such as quota configuration and monitoring
+/// configuration.
+///
+/// Example service configuration:
+///
+///     name: library-example.googleapis.com
+///     endpoints:
+///       # Below entry makes 'google.example.library.v1.Library'
+///       # API be served from endpoint address library-example.googleapis.com.
+///       # It also allows HTTP OPTIONS calls to be passed to the backend, for
+///       # it to decide whether the subsequent cross-origin request is
+///       # allowed to proceed.
+///     - name: library-example.googleapis.com
+///       allow_cors: true
+class Endpoint {
+  /// DEPRECATED: This field is no longer supported. Instead of using aliases,
+  /// please specify multiple google.api.Endpoint for each of the intended
+  /// aliases.
+  ///
+  /// Additional names that this endpoint will be hosted on.
+  core.List<core.String> aliases;
+
+  /// Allowing
+  /// [CORS](https://en.wikipedia.org/wiki/Cross-origin_resource_sharing), aka
+  /// cross-domain traffic, would allow the backends served from this endpoint
+  /// to
+  /// receive and respond to HTTP OPTIONS requests. The response will be used by
+  /// the browser to determine whether the subsequent cross-origin request is
+  /// allowed to proceed.
+  core.bool allowCors;
+
+  /// The list of features enabled on this endpoint.
+  core.List<core.String> features;
+
+  /// The canonical name of this endpoint.
+  core.String name;
+
+  /// The specification of an Internet routable address of API frontend that
+  /// will
+  /// handle requests to this [API
+  /// Endpoint](https://cloud.google.com/apis/design/glossary).
+  /// It should be either a valid IPv4 address or a fully-qualified domain name.
+  /// For example, "8.8.8.8" or "myservice.appspot.com".
+  core.String target;
+
+  Endpoint();
+
+  Endpoint.fromJson(core.Map _json) {
+    if (_json.containsKey("aliases")) {
+      aliases = (_json["aliases"] as core.List).cast<core.String>();
+    }
+    if (_json.containsKey("allowCors")) {
+      allowCors = _json["allowCors"];
+    }
+    if (_json.containsKey("features")) {
+      features = (_json["features"] as core.List).cast<core.String>();
+    }
+    if (_json.containsKey("name")) {
+      name = _json["name"];
+    }
+    if (_json.containsKey("target")) {
+      target = _json["target"];
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (aliases != null) {
+      _json["aliases"] = aliases;
+    }
+    if (allowCors != null) {
+      _json["allowCors"] = allowCors;
+    }
+    if (features != null) {
+      _json["features"] = features;
+    }
+    if (name != null) {
+      _json["name"] = name;
+    }
+    if (target != null) {
+      _json["target"] = target;
+    }
+    return _json;
+  }
+}
+
+/// Enum type definition.
+class Enum {
+  /// Enum value definitions.
+  core.List<EnumValue> enumvalue;
+
+  /// Enum type name.
+  core.String name;
+
+  /// Protocol buffer options.
+  core.List<Option> options;
+
+  /// The source context.
+  SourceContext sourceContext;
+
+  /// The source syntax.
+  /// Possible string values are:
+  /// - "SYNTAX_PROTO2" : Syntax `proto2`.
+  /// - "SYNTAX_PROTO3" : Syntax `proto3`.
+  core.String syntax;
+
+  Enum();
+
+  Enum.fromJson(core.Map _json) {
+    if (_json.containsKey("enumvalue")) {
+      enumvalue = (_json["enumvalue"] as core.List)
+          .map<EnumValue>((value) => new EnumValue.fromJson(value))
+          .toList();
+    }
+    if (_json.containsKey("name")) {
+      name = _json["name"];
+    }
+    if (_json.containsKey("options")) {
+      options = (_json["options"] as core.List)
+          .map<Option>((value) => new Option.fromJson(value))
+          .toList();
+    }
+    if (_json.containsKey("sourceContext")) {
+      sourceContext = new SourceContext.fromJson(_json["sourceContext"]);
+    }
+    if (_json.containsKey("syntax")) {
+      syntax = _json["syntax"];
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (enumvalue != null) {
+      _json["enumvalue"] = enumvalue.map((value) => (value).toJson()).toList();
+    }
+    if (name != null) {
+      _json["name"] = name;
+    }
+    if (options != null) {
+      _json["options"] = options.map((value) => (value).toJson()).toList();
+    }
+    if (sourceContext != null) {
+      _json["sourceContext"] = (sourceContext).toJson();
+    }
+    if (syntax != null) {
+      _json["syntax"] = syntax;
+    }
+    return _json;
+  }
+}
+
+/// Enum value definition.
+class EnumValue {
+  /// Enum value name.
+  core.String name;
+
+  /// Enum value number.
+  core.int number;
+
+  /// Protocol buffer options.
+  core.List<Option> options;
+
+  EnumValue();
+
+  EnumValue.fromJson(core.Map _json) {
+    if (_json.containsKey("name")) {
+      name = _json["name"];
+    }
+    if (_json.containsKey("number")) {
+      number = _json["number"];
+    }
+    if (_json.containsKey("options")) {
+      options = (_json["options"] as core.List)
+          .map<Option>((value) => new Option.fromJson(value))
+          .toList();
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (name != null) {
+      _json["name"] = name;
+    }
+    if (number != null) {
+      _json["number"] = number;
+    }
+    if (options != null) {
+      _json["options"] = options.map((value) => (value).toJson()).toList();
+    }
+    return _json;
+  }
+}
+
+/// Experimental service configuration. These configuration options can
+/// only be used by whitelisted users.
+class Experimental {
+  /// Authorization configuration.
+  AuthorizationConfig authorization;
+
+  Experimental();
+
+  Experimental.fromJson(core.Map _json) {
+    if (_json.containsKey("authorization")) {
+      authorization = new AuthorizationConfig.fromJson(_json["authorization"]);
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (authorization != null) {
+      _json["authorization"] = (authorization).toJson();
+    }
+    return _json;
+  }
+}
+
+/// A single field of a message type.
+class Field {
+  /// The field cardinality.
+  /// Possible string values are:
+  /// - "CARDINALITY_UNKNOWN" : For fields with unknown cardinality.
+  /// - "CARDINALITY_OPTIONAL" : For optional fields.
+  /// - "CARDINALITY_REQUIRED" : For required fields. Proto2 syntax only.
+  /// - "CARDINALITY_REPEATED" : For repeated fields.
+  core.String cardinality;
+
+  /// The string value of the default value of this field. Proto2 syntax only.
+  core.String defaultValue;
+
+  /// The field JSON name.
+  core.String jsonName;
+
+  /// The field type.
+  /// Possible string values are:
+  /// - "TYPE_UNKNOWN" : Field type unknown.
+  /// - "TYPE_DOUBLE" : Field type double.
+  /// - "TYPE_FLOAT" : Field type float.
+  /// - "TYPE_INT64" : Field type int64.
+  /// - "TYPE_UINT64" : Field type uint64.
+  /// - "TYPE_INT32" : Field type int32.
+  /// - "TYPE_FIXED64" : Field type fixed64.
+  /// - "TYPE_FIXED32" : Field type fixed32.
+  /// - "TYPE_BOOL" : Field type bool.
+  /// - "TYPE_STRING" : Field type string.
+  /// - "TYPE_GROUP" : Field type group. Proto2 syntax only, and deprecated.
+  /// - "TYPE_MESSAGE" : Field type message.
+  /// - "TYPE_BYTES" : Field type bytes.
+  /// - "TYPE_UINT32" : Field type uint32.
+  /// - "TYPE_ENUM" : Field type enum.
+  /// - "TYPE_SFIXED32" : Field type sfixed32.
+  /// - "TYPE_SFIXED64" : Field type sfixed64.
+  /// - "TYPE_SINT32" : Field type sint32.
+  /// - "TYPE_SINT64" : Field type sint64.
+  core.String kind;
+
+  /// The field name.
+  core.String name;
+
+  /// The field number.
+  core.int number;
+
+  /// The index of the field type in `Type.oneofs`, for message or enumeration
+  /// types. The first type has index 1; zero means the type is not in the list.
+  core.int oneofIndex;
+
+  /// The protocol buffer options.
+  core.List<Option> options;
+
+  /// Whether to use alternative packed wire representation.
+  core.bool packed;
+
+  /// The field type URL, without the scheme, for message or enumeration
+  /// types. Example: `"type.googleapis.com/google.protobuf.Timestamp"`.
+  core.String typeUrl;
+
+  Field();
+
+  Field.fromJson(core.Map _json) {
+    if (_json.containsKey("cardinality")) {
+      cardinality = _json["cardinality"];
+    }
+    if (_json.containsKey("defaultValue")) {
+      defaultValue = _json["defaultValue"];
+    }
+    if (_json.containsKey("jsonName")) {
+      jsonName = _json["jsonName"];
+    }
+    if (_json.containsKey("kind")) {
+      kind = _json["kind"];
+    }
+    if (_json.containsKey("name")) {
+      name = _json["name"];
+    }
+    if (_json.containsKey("number")) {
+      number = _json["number"];
+    }
+    if (_json.containsKey("oneofIndex")) {
+      oneofIndex = _json["oneofIndex"];
+    }
+    if (_json.containsKey("options")) {
+      options = (_json["options"] as core.List)
+          .map<Option>((value) => new Option.fromJson(value))
+          .toList();
+    }
+    if (_json.containsKey("packed")) {
+      packed = _json["packed"];
+    }
+    if (_json.containsKey("typeUrl")) {
+      typeUrl = _json["typeUrl"];
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (cardinality != null) {
+      _json["cardinality"] = cardinality;
+    }
+    if (defaultValue != null) {
+      _json["defaultValue"] = defaultValue;
+    }
+    if (jsonName != null) {
+      _json["jsonName"] = jsonName;
+    }
+    if (kind != null) {
+      _json["kind"] = kind;
+    }
+    if (name != null) {
+      _json["name"] = name;
+    }
+    if (number != null) {
+      _json["number"] = number;
+    }
+    if (oneofIndex != null) {
+      _json["oneofIndex"] = oneofIndex;
+    }
+    if (options != null) {
+      _json["options"] = options.map((value) => (value).toJson()).toList();
+    }
+    if (packed != null) {
+      _json["packed"] = packed;
+    }
+    if (typeUrl != null) {
+      _json["typeUrl"] = typeUrl;
+    }
+    return _json;
+  }
+}
+
+/// `Service` is the root object of Google service configuration schema. It
+/// describes basic information about a service, such as the name and the
+/// title, and delegates other aspects to sub-sections. Each sub-section is
+/// either a proto message or a repeated proto message that configures a
+/// specific aspect, such as auth. See each proto message definition for
+/// details.
+///
+/// Example:
+///
+///     type: google.api.Service
+///     config_version: 3
+///     name: calendar.googleapis.com
+///     title: Google Calendar API
+///     apis:
+///     - name: google.calendar.v3.Calendar
+///     authentication:
+///       providers:
+///       - id: google_calendar_auth
+///         jwks_uri: https://www.googleapis.com/oauth2/v1/certs
+///         issuer: https://securetoken.google.com
+///       rules:
+///       - selector: "*"
+///         requirements:
+///           provider_id: google_calendar_auth
+class GoogleApiService {
+  /// A list of API interfaces exported by this service. Only the `name` field
+  /// of the google.protobuf.Api needs to be provided by the configuration
+  /// author, as the remaining fields will be derived from the IDL during the
+  /// normalization process. It is an error to specify an API interface here
+  /// which cannot be resolved against the associated IDL files.
+  core.List<Api> apis;
+
+  /// Auth configuration.
+  Authentication authentication;
+
+  /// API backend configuration.
+  Backend backend;
+
+  /// Billing configuration.
+  Billing billing;
+
+  /// The semantic version of the service configuration. The config version
+  /// affects the interpretation of the service configuration. For example,
+  /// certain features are enabled by default for certain config versions.
+  /// The latest config version is `3`.
+  core.int configVersion;
+
+  /// Context configuration.
+  Context context;
+
+  /// Configuration for the service control plane.
+  Control control;
+
+  /// Custom error configuration.
+  CustomError customError;
+
+  /// Additional API documentation.
+  Documentation documentation;
+
+  /// Configuration for network endpoints.  If this is empty, then an endpoint
+  /// with the same name as the service is automatically generated to service
+  /// all
+  /// defined APIs.
+  core.List<Endpoint> endpoints;
+
+  /// A list of all enum types included in this API service.  Enums
+  /// referenced directly or indirectly by the `apis` are automatically
+  /// included.  Enums which are not referenced but shall be included
+  /// should be listed here by name. Example:
+  ///
+  ///     enums:
+  ///     - name: google.someapi.v1.SomeEnum
+  core.List<Enum> enums;
+
+  /// Experimental configuration.
+  Experimental experimental;
+
+  /// HTTP configuration.
+  Http http;
+
+  /// A unique ID for a specific instance of this message, typically assigned
+  /// by the client for tracking purpose. If empty, the server may choose to
+  /// generate one instead. Must be no longer than 60 characters.
+  core.String id;
+
+  /// Logging configuration.
+  Logging logging;
+
+  /// Defines the logs used by this service.
+  core.List<LogDescriptor> logs;
+
+  /// Defines the metrics used by this service.
+  core.List<MetricDescriptor> metrics;
+
+  /// Defines the monitored resources used by this service. This is required
+  /// by the Service.monitoring and Service.logging configurations.
+  core.List<MonitoredResourceDescriptor> monitoredResources;
+
+  /// Monitoring configuration.
+  Monitoring monitoring;
+
+  /// The DNS address at which this service is available,
+  /// e.g. `calendar.googleapis.com`.
+  core.String name;
+
+  /// The Google project that owns this service.
+  core.String producerProjectId;
+
+  /// Quota configuration.
+  Quota quota;
+
+  /// Output only. The source information for this configuration if available.
+  SourceInfo sourceInfo;
+
+  /// System parameter configuration.
+  SystemParameters systemParameters;
+
+  /// A list of all proto message types included in this API service.
+  /// It serves similar purpose as [google.api.Service.types], except that
+  /// these types are not needed by user-defined APIs. Therefore, they will not
+  /// show up in the generated discovery doc. This field should only be used
+  /// to define system APIs in ESF.
+  core.List<Type> systemTypes;
+
+  /// The product title for this service.
+  core.String title;
+
+  /// A list of all proto message types included in this API service.
+  /// Types referenced directly or indirectly by the `apis` are
+  /// automatically included.  Messages which are not referenced but
+  /// shall be included, such as types used by the `google.protobuf.Any` type,
+  /// should be listed here by name. Example:
+  ///
+  ///     types:
+  ///     - name: google.protobuf.Int32
+  core.List<Type> types;
+
+  /// Configuration controlling usage of this service.
+  Usage usage;
+
+  GoogleApiService();
+
+  GoogleApiService.fromJson(core.Map _json) {
+    if (_json.containsKey("apis")) {
+      apis = (_json["apis"] as core.List)
+          .map<Api>((value) => new Api.fromJson(value))
+          .toList();
+    }
+    if (_json.containsKey("authentication")) {
+      authentication = new Authentication.fromJson(_json["authentication"]);
+    }
+    if (_json.containsKey("backend")) {
+      backend = new Backend.fromJson(_json["backend"]);
+    }
+    if (_json.containsKey("billing")) {
+      billing = new Billing.fromJson(_json["billing"]);
+    }
+    if (_json.containsKey("configVersion")) {
+      configVersion = _json["configVersion"];
+    }
+    if (_json.containsKey("context")) {
+      context = new Context.fromJson(_json["context"]);
+    }
+    if (_json.containsKey("control")) {
+      control = new Control.fromJson(_json["control"]);
+    }
+    if (_json.containsKey("customError")) {
+      customError = new CustomError.fromJson(_json["customError"]);
+    }
+    if (_json.containsKey("documentation")) {
+      documentation = new Documentation.fromJson(_json["documentation"]);
+    }
+    if (_json.containsKey("endpoints")) {
+      endpoints = (_json["endpoints"] as core.List)
+          .map<Endpoint>((value) => new Endpoint.fromJson(value))
+          .toList();
+    }
+    if (_json.containsKey("enums")) {
+      enums = (_json["enums"] as core.List)
+          .map<Enum>((value) => new Enum.fromJson(value))
+          .toList();
+    }
+    if (_json.containsKey("experimental")) {
+      experimental = new Experimental.fromJson(_json["experimental"]);
+    }
+    if (_json.containsKey("http")) {
+      http = new Http.fromJson(_json["http"]);
+    }
+    if (_json.containsKey("id")) {
+      id = _json["id"];
+    }
+    if (_json.containsKey("logging")) {
+      logging = new Logging.fromJson(_json["logging"]);
+    }
+    if (_json.containsKey("logs")) {
+      logs = (_json["logs"] as core.List)
+          .map<LogDescriptor>((value) => new LogDescriptor.fromJson(value))
+          .toList();
+    }
+    if (_json.containsKey("metrics")) {
+      metrics = (_json["metrics"] as core.List)
+          .map<MetricDescriptor>(
+              (value) => new MetricDescriptor.fromJson(value))
+          .toList();
+    }
+    if (_json.containsKey("monitoredResources")) {
+      monitoredResources = (_json["monitoredResources"] as core.List)
+          .map<MonitoredResourceDescriptor>(
+              (value) => new MonitoredResourceDescriptor.fromJson(value))
+          .toList();
+    }
+    if (_json.containsKey("monitoring")) {
+      monitoring = new Monitoring.fromJson(_json["monitoring"]);
+    }
+    if (_json.containsKey("name")) {
+      name = _json["name"];
+    }
+    if (_json.containsKey("producerProjectId")) {
+      producerProjectId = _json["producerProjectId"];
+    }
+    if (_json.containsKey("quota")) {
+      quota = new Quota.fromJson(_json["quota"]);
+    }
+    if (_json.containsKey("sourceInfo")) {
+      sourceInfo = new SourceInfo.fromJson(_json["sourceInfo"]);
+    }
+    if (_json.containsKey("systemParameters")) {
+      systemParameters =
+          new SystemParameters.fromJson(_json["systemParameters"]);
+    }
+    if (_json.containsKey("systemTypes")) {
+      systemTypes = (_json["systemTypes"] as core.List)
+          .map<Type>((value) => new Type.fromJson(value))
+          .toList();
+    }
+    if (_json.containsKey("title")) {
+      title = _json["title"];
+    }
+    if (_json.containsKey("types")) {
+      types = (_json["types"] as core.List)
+          .map<Type>((value) => new Type.fromJson(value))
+          .toList();
+    }
+    if (_json.containsKey("usage")) {
+      usage = new Usage.fromJson(_json["usage"]);
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (apis != null) {
+      _json["apis"] = apis.map((value) => (value).toJson()).toList();
+    }
+    if (authentication != null) {
+      _json["authentication"] = (authentication).toJson();
+    }
+    if (backend != null) {
+      _json["backend"] = (backend).toJson();
+    }
+    if (billing != null) {
+      _json["billing"] = (billing).toJson();
+    }
+    if (configVersion != null) {
+      _json["configVersion"] = configVersion;
+    }
+    if (context != null) {
+      _json["context"] = (context).toJson();
+    }
+    if (control != null) {
+      _json["control"] = (control).toJson();
+    }
+    if (customError != null) {
+      _json["customError"] = (customError).toJson();
+    }
+    if (documentation != null) {
+      _json["documentation"] = (documentation).toJson();
+    }
+    if (endpoints != null) {
+      _json["endpoints"] = endpoints.map((value) => (value).toJson()).toList();
+    }
+    if (enums != null) {
+      _json["enums"] = enums.map((value) => (value).toJson()).toList();
+    }
+    if (experimental != null) {
+      _json["experimental"] = (experimental).toJson();
+    }
+    if (http != null) {
+      _json["http"] = (http).toJson();
+    }
+    if (id != null) {
+      _json["id"] = id;
+    }
+    if (logging != null) {
+      _json["logging"] = (logging).toJson();
+    }
+    if (logs != null) {
+      _json["logs"] = logs.map((value) => (value).toJson()).toList();
+    }
+    if (metrics != null) {
+      _json["metrics"] = metrics.map((value) => (value).toJson()).toList();
+    }
+    if (monitoredResources != null) {
+      _json["monitoredResources"] =
+          monitoredResources.map((value) => (value).toJson()).toList();
+    }
+    if (monitoring != null) {
+      _json["monitoring"] = (monitoring).toJson();
+    }
+    if (name != null) {
+      _json["name"] = name;
+    }
+    if (producerProjectId != null) {
+      _json["producerProjectId"] = producerProjectId;
+    }
+    if (quota != null) {
+      _json["quota"] = (quota).toJson();
+    }
+    if (sourceInfo != null) {
+      _json["sourceInfo"] = (sourceInfo).toJson();
+    }
+    if (systemParameters != null) {
+      _json["systemParameters"] = (systemParameters).toJson();
+    }
+    if (systemTypes != null) {
+      _json["systemTypes"] =
+          systemTypes.map((value) => (value).toJson()).toList();
+    }
+    if (title != null) {
+      _json["title"] = title;
+    }
+    if (types != null) {
+      _json["types"] = types.map((value) => (value).toJson()).toList();
+    }
+    if (usage != null) {
+      _json["usage"] = (usage).toJson();
+    }
+    return _json;
+  }
+}
+
+/// The operation metadata returned for the batchend services operation.
+class GoogleApiServiceusageV1OperationMetadata {
+  /// The full name of the resources that this operation is directly
+  /// associated with.
+  core.List<core.String> resourceNames;
+
+  GoogleApiServiceusageV1OperationMetadata();
+
+  GoogleApiServiceusageV1OperationMetadata.fromJson(core.Map _json) {
+    if (_json.containsKey("resourceNames")) {
+      resourceNames = (_json["resourceNames"] as core.List).cast<core.String>();
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (resourceNames != null) {
+      _json["resourceNames"] = resourceNames;
+    }
+    return _json;
+  }
+}
+
+/// A service that is available for use by the consumer.
+class GoogleApiServiceusageV1Service {
+  /// The service configuration of the available service.
+  /// Some fields may be filtered out of the configuration in responses to
+  /// the `ListServices` method. These fields are present only in responses to
+  /// the `GetService` method.
+  GoogleApiServiceusageV1ServiceConfig config;
+
+  /// The resource name of the consumer and service.
+  ///
+  /// A valid name would be:
+  /// - projects/123/services/serviceusage.googleapis.com
+  core.String name;
+
+  /// The resource name of the consumer.
+  ///
+  /// A valid name would be:
+  /// - projects/123
+  core.String parent;
+
+  /// Whether or not the service has been enabled for use by the consumer.
+  /// Possible string values are:
+  /// - "STATE_UNSPECIFIED" : The default value, which indicates that the
+  /// enabled state of the service
+  /// is unspecified or not meaningful. Currently, all consumers other than
+  /// projects (such as folders and organizations) are always in this state.
+  /// - "DISABLED" : The service cannot be used by this consumer. It has either
+  /// been explicitly
+  /// disabled, or has never been enabled.
+  /// - "ENABLED" : The service has been explicitly enabled for use by this
+  /// consumer.
+  core.String state;
+
+  GoogleApiServiceusageV1Service();
+
+  GoogleApiServiceusageV1Service.fromJson(core.Map _json) {
+    if (_json.containsKey("config")) {
+      config =
+          new GoogleApiServiceusageV1ServiceConfig.fromJson(_json["config"]);
+    }
+    if (_json.containsKey("name")) {
+      name = _json["name"];
+    }
+    if (_json.containsKey("parent")) {
+      parent = _json["parent"];
+    }
+    if (_json.containsKey("state")) {
+      state = _json["state"];
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (config != null) {
+      _json["config"] = (config).toJson();
+    }
+    if (name != null) {
+      _json["name"] = name;
+    }
+    if (parent != null) {
+      _json["parent"] = parent;
+    }
+    if (state != null) {
+      _json["state"] = state;
+    }
+    return _json;
+  }
+}
+
+/// The configuration of the service.
+class GoogleApiServiceusageV1ServiceConfig {
+  /// A list of API interfaces exported by this service. Contains only the
+  /// names,
+  /// versions, and method names of the interfaces.
+  core.List<Api> apis;
+
+  /// Auth configuration. Contains only the OAuth rules.
+  Authentication authentication;
+
+  /// Additional API documentation. Contains only the summary and the
+  /// documentation URL.
+  Documentation documentation;
+
+  /// Configuration for network endpoints. Contains only the names and aliases
+  /// of the endpoints.
+  core.List<Endpoint> endpoints;
+
+  /// The DNS address at which this service is available.
+  ///
+  /// An example DNS address would be:
+  /// `calendar.googleapis.com`.
+  core.String name;
+
+  /// Quota configuration.
+  Quota quota;
+
+  /// The product title for this service.
+  core.String title;
+
+  /// Configuration controlling usage of this service.
+  Usage usage;
+
+  GoogleApiServiceusageV1ServiceConfig();
+
+  GoogleApiServiceusageV1ServiceConfig.fromJson(core.Map _json) {
+    if (_json.containsKey("apis")) {
+      apis = (_json["apis"] as core.List)
+          .map<Api>((value) => new Api.fromJson(value))
+          .toList();
+    }
+    if (_json.containsKey("authentication")) {
+      authentication = new Authentication.fromJson(_json["authentication"]);
+    }
+    if (_json.containsKey("documentation")) {
+      documentation = new Documentation.fromJson(_json["documentation"]);
+    }
+    if (_json.containsKey("endpoints")) {
+      endpoints = (_json["endpoints"] as core.List)
+          .map<Endpoint>((value) => new Endpoint.fromJson(value))
+          .toList();
+    }
+    if (_json.containsKey("name")) {
+      name = _json["name"];
+    }
+    if (_json.containsKey("quota")) {
+      quota = new Quota.fromJson(_json["quota"]);
+    }
+    if (_json.containsKey("title")) {
+      title = _json["title"];
+    }
+    if (_json.containsKey("usage")) {
+      usage = new Usage.fromJson(_json["usage"]);
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (apis != null) {
+      _json["apis"] = apis.map((value) => (value).toJson()).toList();
+    }
+    if (authentication != null) {
+      _json["authentication"] = (authentication).toJson();
+    }
+    if (documentation != null) {
+      _json["documentation"] = (documentation).toJson();
+    }
+    if (endpoints != null) {
+      _json["endpoints"] = endpoints.map((value) => (value).toJson()).toList();
+    }
+    if (name != null) {
+      _json["name"] = name;
+    }
+    if (quota != null) {
+      _json["quota"] = (quota).toJson();
+    }
+    if (title != null) {
+      _json["title"] = title;
+    }
+    if (usage != null) {
+      _json["usage"] = (usage).toJson();
+    }
+    return _json;
+  }
+}
+
+/// Defines the HTTP configuration for an API service. It contains a list of
+/// HttpRule, each specifying the mapping of an RPC method
+/// to one or more HTTP REST API methods.
+class Http {
+  /// When set to true, URL path parmeters will be fully URI-decoded except in
+  /// cases of single segment matches in reserved expansion, where "%2F" will be
+  /// left encoded.
+  ///
+  /// The default behavior is to not decode RFC 6570 reserved characters in
+  /// multi
+  /// segment matches.
+  core.bool fullyDecodeReservedExpansion;
+
+  /// A list of HTTP configuration rules that apply to individual API methods.
+  ///
+  /// **NOTE:** All service configuration rules follow "last one wins" order.
+  core.List<HttpRule> rules;
+
+  Http();
+
+  Http.fromJson(core.Map _json) {
+    if (_json.containsKey("fullyDecodeReservedExpansion")) {
+      fullyDecodeReservedExpansion = _json["fullyDecodeReservedExpansion"];
+    }
+    if (_json.containsKey("rules")) {
+      rules = (_json["rules"] as core.List)
+          .map<HttpRule>((value) => new HttpRule.fromJson(value))
+          .toList();
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (fullyDecodeReservedExpansion != null) {
+      _json["fullyDecodeReservedExpansion"] = fullyDecodeReservedExpansion;
+    }
+    if (rules != null) {
+      _json["rules"] = rules.map((value) => (value).toJson()).toList();
+    }
+    return _json;
+  }
+}
+
+/// `HttpRule` defines the mapping of an RPC method to one or more HTTP
+/// REST API methods. The mapping specifies how different portions of the RPC
+/// request message are mapped to URL path, URL query parameters, and
+/// HTTP request body. The mapping is typically specified as an
+/// `google.api.http` annotation on the RPC method,
+/// see "google/api/annotations.proto" for details.
+///
+/// The mapping consists of a field specifying the path template and
+/// method kind.  The path template can refer to fields in the request
+/// message, as in the example below which describes a REST GET
+/// operation on a resource collection of messages:
+///
+///
+///     service Messaging {
+///       rpc GetMessage(GetMessageRequest) returns (Message) {
+/// option (google.api.http).get = "/v1/messages/{message_id}/{sub.subfield}";
+///       }
+///     }
+///     message GetMessageRequest {
+///       message SubMessage {
+///         string subfield = 1;
+///       }
+///       string message_id = 1; // mapped to the URL
+///       SubMessage sub = 2;    // `sub.subfield` is url-mapped
+///     }
+///     message Message {
+///       string text = 1; // content of the resource
+///     }
+///
+/// The same http annotation can alternatively be expressed inside the
+/// `GRPC API Configuration` YAML file.
+///
+///     http:
+///       rules:
+///         - selector: <proto_package_name>.Messaging.GetMessage
+///           get: /v1/messages/{message_id}/{sub.subfield}
+///
+/// This definition enables an automatic, bidrectional mapping of HTTP
+/// JSON to RPC. Example:
+///
+/// HTTP | RPC
+/// -----|-----
+/// `GET /v1/messages/123456/foo`  | `GetMessage(message_id: "123456" sub:
+/// SubMessage(subfield: "foo"))`
+///
+/// In general, not only fields but also field paths can be referenced
+/// from a path pattern. Fields mapped to the path pattern cannot be
+/// repeated and must have a primitive (non-message) type.
+///
+/// Any fields in the request message which are not bound by the path
+/// pattern automatically become (optional) HTTP query
+/// parameters. Assume the following definition of the request message:
+///
+///
+///     service Messaging {
+///       rpc GetMessage(GetMessageRequest) returns (Message) {
+///         option (google.api.http).get = "/v1/messages/{message_id}";
+///       }
+///     }
+///     message GetMessageRequest {
+///       message SubMessage {
+///         string subfield = 1;
+///       }
+///       string message_id = 1; // mapped to the URL
+///       int64 revision = 2;    // becomes a parameter
+///       SubMessage sub = 3;    // `sub.subfield` becomes a parameter
+///     }
+///
+///
+/// This enables a HTTP JSON to RPC mapping as below:
+///
+/// HTTP | RPC
+/// -----|-----
+/// `GET /v1/messages/123456?revision=2&sub.subfield=foo` |
+/// `GetMessage(message_id: "123456" revision: 2 sub: SubMessage(subfield:
+/// "foo"))`
+///
+/// Note that fields which are mapped to HTTP parameters must have a
+/// primitive type or a repeated primitive type. Message types are not
+/// allowed. In the case of a repeated type, the parameter can be
+/// repeated in the URL, as in `...?param=A&param=B`.
+///
+/// For HTTP method kinds which allow a request body, the `body` field
+/// specifies the mapping. Consider a REST update method on the
+/// message resource collection:
+///
+///
+///     service Messaging {
+///       rpc UpdateMessage(UpdateMessageRequest) returns (Message) {
+///         option (google.api.http) = {
+///           put: "/v1/messages/{message_id}"
+///           body: "message"
+///         };
+///       }
+///     }
+///     message UpdateMessageRequest {
+///       string message_id = 1; // mapped to the URL
+///       Message message = 2;   // mapped to the body
+///     }
+///
+///
+/// The following HTTP JSON to RPC mapping is enabled, where the
+/// representation of the JSON in the request body is determined by
+/// protos JSON encoding:
+///
+/// HTTP | RPC
+/// -----|-----
+/// `PUT /v1/messages/123456 { "text": "Hi!" }` | `UpdateMessage(message_id:
+/// "123456" message { text: "Hi!" })`
+///
+/// The special name `*` can be used in the body mapping to define that
+/// every field not bound by the path template should be mapped to the
+/// request body.  This enables the following alternative definition of
+/// the update method:
+///
+///     service Messaging {
+///       rpc UpdateMessage(Message) returns (Message) {
+///         option (google.api.http) = {
+///           put: "/v1/messages/{message_id}"
+///           body: "*"
+///         };
+///       }
+///     }
+///     message Message {
+///       string message_id = 1;
+///       string text = 2;
+///     }
+///
+///
+/// The following HTTP JSON to RPC mapping is enabled:
+///
+/// HTTP | RPC
+/// -----|-----
+/// `PUT /v1/messages/123456 { "text": "Hi!" }` | `UpdateMessage(message_id:
+/// "123456" text: "Hi!")`
+///
+/// Note that when using `*` in the body mapping, it is not possible to
+/// have HTTP parameters, as all fields not bound by the path end in
+/// the body. This makes this option more rarely used in practice of
+/// defining REST APIs. The common usage of `*` is in custom methods
+/// which don't use the URL at all for transferring data.
+///
+/// It is possible to define multiple HTTP methods for one RPC by using
+/// the `additional_bindings` option. Example:
+///
+///     service Messaging {
+///       rpc GetMessage(GetMessageRequest) returns (Message) {
+///         option (google.api.http) = {
+///           get: "/v1/messages/{message_id}"
+///           additional_bindings {
+///             get: "/v1/users/{user_id}/messages/{message_id}"
+///           }
+///         };
+///       }
+///     }
+///     message GetMessageRequest {
+///       string message_id = 1;
+///       string user_id = 2;
+///     }
+///
+///
+/// This enables the following two alternative HTTP JSON to RPC
+/// mappings:
+///
+/// HTTP | RPC
+/// -----|-----
+/// `GET /v1/messages/123456` | `GetMessage(message_id: "123456")`
+/// `GET /v1/users/me/messages/123456` | `GetMessage(user_id: "me" message_id:
+/// "123456")`
+///
+/// # Rules for HTTP mapping
+///
+/// The rules for mapping HTTP path, query parameters, and body fields
+/// to the request message are as follows:
+///
+/// 1. The `body` field specifies either `*` or a field path, or is
+///    omitted. If omitted, it indicates there is no HTTP request body.
+/// 2. Leaf fields (recursive expansion of nested messages in the
+///    request) can be classified into three types:
+///     (a) Matched in the URL template.
+///     (b) Covered by body (if body is `*`, everything except (a) fields;
+///         else everything under the body field)
+///     (c) All other fields.
+/// 3. URL query parameters found in the HTTP request are mapped to (c) fields.
+/// 4. Any body sent with an HTTP request can contain only (b) fields.
+///
+/// The syntax of the path template is as follows:
+///
+///     Template = "/" Segments [ Verb ] ;
+///     Segments = Segment { "/" Segment } ;
+///     Segment  = "*" | "**" | LITERAL | Variable ;
+///     Variable = "{" FieldPath [ "=" Segments ] "}" ;
+///     FieldPath = IDENT { "." IDENT } ;
+///     Verb     = ":" LITERAL ;
+///
+/// The syntax `*` matches a single path segment. The syntax `**` matches zero
+/// or more path segments, which must be the last part of the path except the
+/// `Verb`. The syntax `LITERAL` matches literal text in the path.
+///
+/// The syntax `Variable` matches part of the URL path as specified by its
+/// template. A variable template must not contain other variables. If a
+/// variable
+/// matches a single path segment, its template may be omitted, e.g. `{var}`
+/// is equivalent to `{var=*}`.
+///
+/// If a variable contains exactly one path segment, such as `"{var}"` or
+/// `"{var=*}"`, when such a variable is expanded into a URL path, all
+/// characters
+/// except `[-_.~0-9a-zA-Z]` are percent-encoded. Such variables show up in the
+/// Discovery Document as `{var}`.
+///
+/// If a variable contains one or more path segments, such as `"{var=foo / * }"`
+/// or `"{var=**}"`, when such a variable is expanded into a URL path, all
+/// characters except `[-_.~/0-9a-zA-Z]` are percent-encoded. Such variables
+/// show up in the Discovery Document as `{+var}`.
+///
+/// NOTE: While the single segment variable matches the semantics of
+/// [RFC 6570](https://tools.ietf.org/html/rfc6570) Section 3.2.2
+/// Simple String Expansion, the multi segment variable **does not** match
+/// RFC 6570 Reserved Expansion. The reason is that the Reserved Expansion
+/// does not expand special characters like `?` and `#`, which would lead
+/// to invalid URLs.
+///
+/// NOTE: the field paths in variables and in the `body` must not refer to
+/// repeated fields or map fields.
+class HttpRule {
+  /// Additional HTTP bindings for the selector. Nested bindings must
+  /// not contain an `additional_bindings` field themselves (that is,
+  /// the nesting may only be one level deep).
+  core.List<HttpRule> additionalBindings;
+
+  /// Specifies the permission(s) required for an API element for the overall
+  /// API request to succeed. It is typically used to mark request message
+  /// fields
+  /// that contain the name of the resource and indicates the permissions that
+  /// will be checked on that resource.
+  core.List<AuthorizationRule> authorizations;
+
+  /// The name of the request field whose value is mapped to the HTTP body, or
+  /// `*` for mapping all fields not captured by the path pattern to the HTTP
+  /// body. NOTE: the referred field must not be a repeated field and must be
+  /// present at the top-level of request message type.
+  core.String body;
+
+  /// The custom pattern is used for specifying an HTTP method that is not
+  /// included in the `pattern` field, such as HEAD, or "*" to leave the
+  /// HTTP method unspecified for this rule. The wild-card rule is useful
+  /// for services that provide content to Web (HTML) clients.
+  CustomHttpPattern custom;
+
+  /// Used for deleting a resource.
+  core.String delete;
+
+  /// Used for listing and getting information about resources.
+  core.String get;
+
+  /// Use this only for Scotty Requests. Do not use this for bytestream methods.
+  /// For media support, add instead [][google.bytestream.RestByteStream] as an
+  /// API to your configuration.
+  MediaDownload mediaDownload;
+
+  /// Use this only for Scotty Requests. Do not use this for media support using
+  /// Bytestream, add instead
+  /// [][google.bytestream.RestByteStream] as an API to your
+  /// configuration for Bytestream methods.
+  MediaUpload mediaUpload;
+
+  /// Used for updating a resource.
+  core.String patch;
+
+  /// Used for creating a resource.
+  core.String post;
+
+  /// Used for updating a resource.
+  core.String put;
+
+  /// Optional. The name of the response field whose value is mapped to the HTTP
+  /// body of response. Other response fields are ignored. When
+  /// not set, the response message will be used as HTTP body of response.
+  core.String responseBody;
+
+  /// DO NOT USE. This is an experimental field.
+  ///
+  /// Optional. The REST collection name is by default derived from the URL
+  /// pattern. If specified, this field overrides the default collection name.
+  /// Example:
+  ///
+  ///     rpc AddressesAggregatedList(AddressesAggregatedListRequest)
+  ///         returns (AddressesAggregatedListResponse) {
+  ///       option (google.api.http) = {
+  ///         get: "/v1/projects/{project_id}/aggregated/addresses"
+  ///         rest_collection: "projects.addresses"
+  ///       };
+  ///     }
+  ///
+  /// This method has the automatically derived collection name
+  /// "projects.aggregated". Because, semantically, this rpc is actually an
+  /// operation on the "projects.addresses" collection, the `rest_collection`
+  /// field is configured to override the derived collection name.
+  core.String restCollection;
+
+  /// DO NOT USE. This is an experimental field.
+  ///
+  /// Optional. The rest method name is by default derived from the URL
+  /// pattern. If specified, this field overrides the default method name.
+  /// Example:
+  ///
+  ///     rpc CreateResource(CreateResourceRequest)
+  ///         returns (CreateResourceResponse) {
+  ///       option (google.api.http) = {
+  ///         post: "/v1/resources",
+  ///         body: "resource",
+  ///         rest_method_name: "insert"
+  ///       };
+  ///     }
+  ///
+  /// This method has the automatically derived rest method name
+  /// "create", but for backwards compatibility with apiary, it is specified as
+  /// insert.
+  core.String restMethodName;
+
+  /// Selects methods to which this rule applies.
+  ///
+  /// Refer to selector for syntax details.
+  core.String selector;
+
+  HttpRule();
+
+  HttpRule.fromJson(core.Map _json) {
+    if (_json.containsKey("additionalBindings")) {
+      additionalBindings = (_json["additionalBindings"] as core.List)
+          .map<HttpRule>((value) => new HttpRule.fromJson(value))
+          .toList();
+    }
+    if (_json.containsKey("authorizations")) {
+      authorizations = (_json["authorizations"] as core.List)
+          .map<AuthorizationRule>(
+              (value) => new AuthorizationRule.fromJson(value))
+          .toList();
+    }
+    if (_json.containsKey("body")) {
+      body = _json["body"];
+    }
+    if (_json.containsKey("custom")) {
+      custom = new CustomHttpPattern.fromJson(_json["custom"]);
+    }
+    if (_json.containsKey("delete")) {
+      delete = _json["delete"];
+    }
+    if (_json.containsKey("get")) {
+      get = _json["get"];
+    }
+    if (_json.containsKey("mediaDownload")) {
+      mediaDownload = new MediaDownload.fromJson(_json["mediaDownload"]);
+    }
+    if (_json.containsKey("mediaUpload")) {
+      mediaUpload = new MediaUpload.fromJson(_json["mediaUpload"]);
+    }
+    if (_json.containsKey("patch")) {
+      patch = _json["patch"];
+    }
+    if (_json.containsKey("post")) {
+      post = _json["post"];
+    }
+    if (_json.containsKey("put")) {
+      put = _json["put"];
+    }
+    if (_json.containsKey("responseBody")) {
+      responseBody = _json["responseBody"];
+    }
+    if (_json.containsKey("restCollection")) {
+      restCollection = _json["restCollection"];
+    }
+    if (_json.containsKey("restMethodName")) {
+      restMethodName = _json["restMethodName"];
+    }
+    if (_json.containsKey("selector")) {
+      selector = _json["selector"];
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (additionalBindings != null) {
+      _json["additionalBindings"] =
+          additionalBindings.map((value) => (value).toJson()).toList();
+    }
+    if (authorizations != null) {
+      _json["authorizations"] =
+          authorizations.map((value) => (value).toJson()).toList();
+    }
+    if (body != null) {
+      _json["body"] = body;
+    }
+    if (custom != null) {
+      _json["custom"] = (custom).toJson();
+    }
+    if (delete != null) {
+      _json["delete"] = delete;
+    }
+    if (get != null) {
+      _json["get"] = get;
+    }
+    if (mediaDownload != null) {
+      _json["mediaDownload"] = (mediaDownload).toJson();
+    }
+    if (mediaUpload != null) {
+      _json["mediaUpload"] = (mediaUpload).toJson();
+    }
+    if (patch != null) {
+      _json["patch"] = patch;
+    }
+    if (post != null) {
+      _json["post"] = post;
+    }
+    if (put != null) {
+      _json["put"] = put;
+    }
+    if (responseBody != null) {
+      _json["responseBody"] = responseBody;
+    }
+    if (restCollection != null) {
+      _json["restCollection"] = restCollection;
+    }
+    if (restMethodName != null) {
+      _json["restMethodName"] = restMethodName;
+    }
+    if (selector != null) {
+      _json["selector"] = selector;
+    }
+    return _json;
+  }
+}
+
+/// A description of a label.
+class LabelDescriptor {
+  /// A human-readable description for the label.
+  core.String description;
+
+  /// The label key.
+  core.String key;
+
+  /// The type of data that can be assigned to the label.
+  /// Possible string values are:
+  /// - "STRING" : A variable-length string. This is the default.
+  /// - "BOOL" : Boolean; true or false.
+  /// - "INT64" : A 64-bit signed integer.
+  core.String valueType;
+
+  LabelDescriptor();
+
+  LabelDescriptor.fromJson(core.Map _json) {
+    if (_json.containsKey("description")) {
+      description = _json["description"];
+    }
+    if (_json.containsKey("key")) {
+      key = _json["key"];
+    }
+    if (_json.containsKey("valueType")) {
+      valueType = _json["valueType"];
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (description != null) {
+      _json["description"] = description;
+    }
+    if (key != null) {
+      _json["key"] = key;
+    }
+    if (valueType != null) {
+      _json["valueType"] = valueType;
+    }
+    return _json;
+  }
+}
+
+/// The response message for Operations.ListOperations.
+class ListOperationsResponse {
+  /// The standard List next-page token.
+  core.String nextPageToken;
+
+  /// A list of operations that matches the specified filter in the request.
+  core.List<Operation> operations;
+
+  ListOperationsResponse();
+
+  ListOperationsResponse.fromJson(core.Map _json) {
+    if (_json.containsKey("nextPageToken")) {
+      nextPageToken = _json["nextPageToken"];
+    }
+    if (_json.containsKey("operations")) {
+      operations = (_json["operations"] as core.List)
+          .map<Operation>((value) => new Operation.fromJson(value))
+          .toList();
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (nextPageToken != null) {
+      _json["nextPageToken"] = nextPageToken;
+    }
+    if (operations != null) {
+      _json["operations"] =
+          operations.map((value) => (value).toJson()).toList();
+    }
+    return _json;
+  }
+}
+
+/// Response message for the `ListServices` method.
+class ListServicesResponse {
+  /// Token that can be passed to `ListServices` to resume a paginated
+  /// query.
+  core.String nextPageToken;
+
+  /// The available services for the requested project.
+  core.List<GoogleApiServiceusageV1Service> services;
+
+  ListServicesResponse();
+
+  ListServicesResponse.fromJson(core.Map _json) {
+    if (_json.containsKey("nextPageToken")) {
+      nextPageToken = _json["nextPageToken"];
+    }
+    if (_json.containsKey("services")) {
+      services = (_json["services"] as core.List)
+          .map<GoogleApiServiceusageV1Service>(
+              (value) => new GoogleApiServiceusageV1Service.fromJson(value))
+          .toList();
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (nextPageToken != null) {
+      _json["nextPageToken"] = nextPageToken;
+    }
+    if (services != null) {
+      _json["services"] = services.map((value) => (value).toJson()).toList();
+    }
+    return _json;
+  }
+}
+
+/// A description of a log type. Example in YAML format:
+///
+///     - name: library.googleapis.com/activity_history
+///       description: The history of borrowing and returning library items.
+///       display_name: Activity
+///       labels:
+///       - key: /customer_id
+///         description: Identifier of a library customer
+class LogDescriptor {
+  /// A human-readable description of this log. This information appears in
+  /// the documentation and can contain details.
+  core.String description;
+
+  /// The human-readable name for this log. This information appears on
+  /// the user interface and should be concise.
+  core.String displayName;
+
+  /// The set of labels that are available to describe a specific log entry.
+  /// Runtime requests that contain labels not specified here are
+  /// considered invalid.
+  core.List<LabelDescriptor> labels;
+
+  /// The name of the log. It must be less than 512 characters long and can
+  /// include the following characters: upper- and lower-case alphanumeric
+  /// characters [A-Za-z0-9], and punctuation characters including
+  /// slash, underscore, hyphen, period [/_-.].
+  core.String name;
+
+  LogDescriptor();
+
+  LogDescriptor.fromJson(core.Map _json) {
+    if (_json.containsKey("description")) {
+      description = _json["description"];
+    }
+    if (_json.containsKey("displayName")) {
+      displayName = _json["displayName"];
+    }
+    if (_json.containsKey("labels")) {
+      labels = (_json["labels"] as core.List)
+          .map<LabelDescriptor>((value) => new LabelDescriptor.fromJson(value))
+          .toList();
+    }
+    if (_json.containsKey("name")) {
+      name = _json["name"];
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (description != null) {
+      _json["description"] = description;
+    }
+    if (displayName != null) {
+      _json["displayName"] = displayName;
+    }
+    if (labels != null) {
+      _json["labels"] = labels.map((value) => (value).toJson()).toList();
+    }
+    if (name != null) {
+      _json["name"] = name;
+    }
+    return _json;
+  }
+}
+
+/// Logging configuration of the service.
+///
+/// The following example shows how to configure logs to be sent to the
+/// producer and consumer projects. In the example, the `activity_history`
+/// log is sent to both the producer and consumer projects, whereas the
+/// `purchase_history` log is only sent to the producer project.
+///
+///     monitored_resources:
+///     - type: library.googleapis.com/branch
+///       labels:
+///       - key: /city
+///         description: The city where the library branch is located in.
+///       - key: /name
+///         description: The name of the branch.
+///     logs:
+///     - name: activity_history
+///       labels:
+///       - key: /customer_id
+///     - name: purchase_history
+///     logging:
+///       producer_destinations:
+///       - monitored_resource: library.googleapis.com/branch
+///         logs:
+///         - activity_history
+///         - purchase_history
+///       consumer_destinations:
+///       - monitored_resource: library.googleapis.com/branch
+///         logs:
+///         - activity_history
+class Logging {
+  /// Logging configurations for sending logs to the consumer project.
+  /// There can be multiple consumer destinations, each one must have a
+  /// different monitored resource type. A log can be used in at most
+  /// one consumer destination.
+  core.List<LoggingDestination> consumerDestinations;
+
+  /// Logging configurations for sending logs to the producer project.
+  /// There can be multiple producer destinations, each one must have a
+  /// different monitored resource type. A log can be used in at most
+  /// one producer destination.
+  core.List<LoggingDestination> producerDestinations;
+
+  Logging();
+
+  Logging.fromJson(core.Map _json) {
+    if (_json.containsKey("consumerDestinations")) {
+      consumerDestinations = (_json["consumerDestinations"] as core.List)
+          .map<LoggingDestination>(
+              (value) => new LoggingDestination.fromJson(value))
+          .toList();
+    }
+    if (_json.containsKey("producerDestinations")) {
+      producerDestinations = (_json["producerDestinations"] as core.List)
+          .map<LoggingDestination>(
+              (value) => new LoggingDestination.fromJson(value))
+          .toList();
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (consumerDestinations != null) {
+      _json["consumerDestinations"] =
+          consumerDestinations.map((value) => (value).toJson()).toList();
+    }
+    if (producerDestinations != null) {
+      _json["producerDestinations"] =
+          producerDestinations.map((value) => (value).toJson()).toList();
+    }
+    return _json;
+  }
+}
+
+/// Configuration of a specific logging destination (the producer project
+/// or the consumer project).
+class LoggingDestination {
+  /// Names of the logs to be sent to this destination. Each name must
+  /// be defined in the Service.logs section. If the log name is
+  /// not a domain scoped name, it will be automatically prefixed with
+  /// the service name followed by "/".
+  core.List<core.String> logs;
+
+  /// The monitored resource type. The type must be defined in the
+  /// Service.monitored_resources section.
+  core.String monitoredResource;
+
+  LoggingDestination();
+
+  LoggingDestination.fromJson(core.Map _json) {
+    if (_json.containsKey("logs")) {
+      logs = (_json["logs"] as core.List).cast<core.String>();
+    }
+    if (_json.containsKey("monitoredResource")) {
+      monitoredResource = _json["monitoredResource"];
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (logs != null) {
+      _json["logs"] = logs;
+    }
+    if (monitoredResource != null) {
+      _json["monitoredResource"] = monitoredResource;
+    }
+    return _json;
+  }
+}
+
+/// Defines the Media configuration for a service in case of a download.
+/// Use this only for Scotty Requests. Do not use this for media support using
+/// Bytestream, add instead [][google.bytestream.RestByteStream] as an API to
+/// your configuration for Bytestream methods.
+class MediaDownload {
+  /// A boolean that determines whether a notification for the completion of a
+  /// download should be sent to the backend.
+  core.bool completeNotification;
+
+  /// DO NOT USE FIELDS BELOW THIS LINE UNTIL THIS WARNING IS REMOVED.
+  ///
+  /// Specify name of the download service if one is used for download.
+  core.String downloadService;
+
+  /// Name of the Scotty dropzone to use for the current API.
+  core.String dropzone;
+
+  /// Whether download is enabled.
+  core.bool enabled;
+
+  /// Optional maximum acceptable size for direct download.
+  /// The size is specified in bytes.
+  core.String maxDirectDownloadSize;
+
+  /// A boolean that determines if direct download from ESF should be used for
+  /// download of this media.
+  core.bool useDirectDownload;
+
+  MediaDownload();
+
+  MediaDownload.fromJson(core.Map _json) {
+    if (_json.containsKey("completeNotification")) {
+      completeNotification = _json["completeNotification"];
+    }
+    if (_json.containsKey("downloadService")) {
+      downloadService = _json["downloadService"];
+    }
+    if (_json.containsKey("dropzone")) {
+      dropzone = _json["dropzone"];
+    }
+    if (_json.containsKey("enabled")) {
+      enabled = _json["enabled"];
+    }
+    if (_json.containsKey("maxDirectDownloadSize")) {
+      maxDirectDownloadSize = _json["maxDirectDownloadSize"];
+    }
+    if (_json.containsKey("useDirectDownload")) {
+      useDirectDownload = _json["useDirectDownload"];
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (completeNotification != null) {
+      _json["completeNotification"] = completeNotification;
+    }
+    if (downloadService != null) {
+      _json["downloadService"] = downloadService;
+    }
+    if (dropzone != null) {
+      _json["dropzone"] = dropzone;
+    }
+    if (enabled != null) {
+      _json["enabled"] = enabled;
+    }
+    if (maxDirectDownloadSize != null) {
+      _json["maxDirectDownloadSize"] = maxDirectDownloadSize;
+    }
+    if (useDirectDownload != null) {
+      _json["useDirectDownload"] = useDirectDownload;
+    }
+    return _json;
+  }
+}
+
+/// Defines the Media configuration for a service in case of an upload.
+/// Use this only for Scotty Requests. Do not use this for media support using
+/// Bytestream, add instead [][google.bytestream.RestByteStream] as an API to
+/// your configuration for Bytestream methods.
+class MediaUpload {
+  /// A boolean that determines whether a notification for the completion of an
+  /// upload should be sent to the backend. These notifications will not be seen
+  /// by the client and will not consume quota.
+  core.bool completeNotification;
+
+  /// Name of the Scotty dropzone to use for the current API.
+  core.String dropzone;
+
+  /// Whether upload is enabled.
+  core.bool enabled;
+
+  /// Optional maximum acceptable size for an upload.
+  /// The size is specified in bytes.
+  core.String maxSize;
+
+  /// An array of mimetype patterns. Esf will only accept uploads that match one
+  /// of the given patterns.
+  core.List<core.String> mimeTypes;
+
+  /// Whether to receive a notification for progress changes of media upload.
+  core.bool progressNotification;
+
+  /// Whether to receive a notification on the start of media upload.
+  core.bool startNotification;
+
+  /// DO NOT USE FIELDS BELOW THIS LINE UNTIL THIS WARNING IS REMOVED.
+  ///
+  /// Specify name of the upload service if one is used for upload.
+  core.String uploadService;
+
+  MediaUpload();
+
+  MediaUpload.fromJson(core.Map _json) {
+    if (_json.containsKey("completeNotification")) {
+      completeNotification = _json["completeNotification"];
+    }
+    if (_json.containsKey("dropzone")) {
+      dropzone = _json["dropzone"];
+    }
+    if (_json.containsKey("enabled")) {
+      enabled = _json["enabled"];
+    }
+    if (_json.containsKey("maxSize")) {
+      maxSize = _json["maxSize"];
+    }
+    if (_json.containsKey("mimeTypes")) {
+      mimeTypes = (_json["mimeTypes"] as core.List).cast<core.String>();
+    }
+    if (_json.containsKey("progressNotification")) {
+      progressNotification = _json["progressNotification"];
+    }
+    if (_json.containsKey("startNotification")) {
+      startNotification = _json["startNotification"];
+    }
+    if (_json.containsKey("uploadService")) {
+      uploadService = _json["uploadService"];
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (completeNotification != null) {
+      _json["completeNotification"] = completeNotification;
+    }
+    if (dropzone != null) {
+      _json["dropzone"] = dropzone;
+    }
+    if (enabled != null) {
+      _json["enabled"] = enabled;
+    }
+    if (maxSize != null) {
+      _json["maxSize"] = maxSize;
+    }
+    if (mimeTypes != null) {
+      _json["mimeTypes"] = mimeTypes;
+    }
+    if (progressNotification != null) {
+      _json["progressNotification"] = progressNotification;
+    }
+    if (startNotification != null) {
+      _json["startNotification"] = startNotification;
+    }
+    if (uploadService != null) {
+      _json["uploadService"] = uploadService;
+    }
+    return _json;
+  }
+}
+
+/// Method represents a method of an API interface.
+class Method {
+  /// The simple name of this method.
+  core.String name;
+
+  /// Any metadata attached to the method.
+  core.List<Option> options;
+
+  /// If true, the request is streamed.
+  core.bool requestStreaming;
+
+  /// A URL of the input message type.
+  core.String requestTypeUrl;
+
+  /// If true, the response is streamed.
+  core.bool responseStreaming;
+
+  /// The URL of the output message type.
+  core.String responseTypeUrl;
+
+  /// The source syntax of this method.
+  /// Possible string values are:
+  /// - "SYNTAX_PROTO2" : Syntax `proto2`.
+  /// - "SYNTAX_PROTO3" : Syntax `proto3`.
+  core.String syntax;
+
+  Method();
+
+  Method.fromJson(core.Map _json) {
+    if (_json.containsKey("name")) {
+      name = _json["name"];
+    }
+    if (_json.containsKey("options")) {
+      options = (_json["options"] as core.List)
+          .map<Option>((value) => new Option.fromJson(value))
+          .toList();
+    }
+    if (_json.containsKey("requestStreaming")) {
+      requestStreaming = _json["requestStreaming"];
+    }
+    if (_json.containsKey("requestTypeUrl")) {
+      requestTypeUrl = _json["requestTypeUrl"];
+    }
+    if (_json.containsKey("responseStreaming")) {
+      responseStreaming = _json["responseStreaming"];
+    }
+    if (_json.containsKey("responseTypeUrl")) {
+      responseTypeUrl = _json["responseTypeUrl"];
+    }
+    if (_json.containsKey("syntax")) {
+      syntax = _json["syntax"];
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (name != null) {
+      _json["name"] = name;
+    }
+    if (options != null) {
+      _json["options"] = options.map((value) => (value).toJson()).toList();
+    }
+    if (requestStreaming != null) {
+      _json["requestStreaming"] = requestStreaming;
+    }
+    if (requestTypeUrl != null) {
+      _json["requestTypeUrl"] = requestTypeUrl;
+    }
+    if (responseStreaming != null) {
+      _json["responseStreaming"] = responseStreaming;
+    }
+    if (responseTypeUrl != null) {
+      _json["responseTypeUrl"] = responseTypeUrl;
+    }
+    if (syntax != null) {
+      _json["syntax"] = syntax;
+    }
+    return _json;
+  }
+}
+
+/// Defines a metric type and its schema. Once a metric descriptor is created,
+/// deleting or altering it stops data collection and makes the metric type's
+/// existing data unusable.
+class MetricDescriptor {
+  /// A detailed description of the metric, which can be used in documentation.
+  core.String description;
+
+  /// A concise name for the metric, which can be displayed in user interfaces.
+  /// Use sentence case without an ending period, for example "Request count".
+  /// This field is optional but it is recommended to be set for any metrics
+  /// associated with user-visible concepts, such as Quota.
+  core.String displayName;
+
+  /// The set of labels that can be used to describe a specific
+  /// instance of this metric type. For example, the
+  /// `appengine.googleapis.com/http/server/response_latencies` metric
+  /// type has a label for the HTTP response code, `response_code`, so
+  /// you can look at latencies for successful responses or just
+  /// for responses that failed.
+  core.List<LabelDescriptor> labels;
+
+  /// Optional. Metadata which can be used to guide usage of the metric.
+  MetricDescriptorMetadata metadata;
+
+  /// Whether the metric records instantaneous values, changes to a value, etc.
+  /// Some combinations of `metric_kind` and `value_type` might not be
+  /// supported.
+  /// Possible string values are:
+  /// - "METRIC_KIND_UNSPECIFIED" : Do not use this default value.
+  /// - "GAUGE" : An instantaneous measurement of a value.
+  /// - "DELTA" : The change in a value during a time interval.
+  /// - "CUMULATIVE" : A value accumulated over a time interval.  Cumulative
+  /// measurements in a time series should have the same start time
+  /// and increasing end times, until an event resets the cumulative
+  /// value to zero and sets a new start time for the following
+  /// points.
+  core.String metricKind;
+
+  /// The resource name of the metric descriptor.
+  core.String name;
+
+  /// The metric type, including its DNS name prefix. The type is not
+  /// URL-encoded.  All user-defined metric types have the DNS name
+  /// `custom.googleapis.com` or `external.googleapis.com`.  Metric types should
+  /// use a natural hierarchical grouping. For example:
+  ///
+  ///     "custom.googleapis.com/invoice/paid/amount"
+  ///     "external.googleapis.com/prometheus/up"
+  ///     "appengine.googleapis.com/http/server/response_latencies"
+  core.String type;
+
+  /// The unit in which the metric value is reported. It is only applicable
+  /// if the `value_type` is `INT64`, `DOUBLE`, or `DISTRIBUTION`. The
+  /// supported units are a subset of [The Unified Code for Units of
+  /// Measure](http://unitsofmeasure.org/ucum.html) standard:
+  ///
+  /// **Basic units (UNIT)**
+  ///
+  /// * `bit`   bit
+  /// * `By`    byte
+  /// * `s`     second
+  /// * `min`   minute
+  /// * `h`     hour
+  /// * `d`     day
+  ///
+  /// **Prefixes (PREFIX)**
+  ///
+  /// * `k`     kilo    (10**3)
+  /// * `M`     mega    (10**6)
+  /// * `G`     giga    (10**9)
+  /// * `T`     tera    (10**12)
+  /// * `P`     peta    (10**15)
+  /// * `E`     exa     (10**18)
+  /// * `Z`     zetta   (10**21)
+  /// * `Y`     yotta   (10**24)
+  /// * `m`     milli   (10**-3)
+  /// * `u`     micro   (10**-6)
+  /// * `n`     nano    (10**-9)
+  /// * `p`     pico    (10**-12)
+  /// * `f`     femto   (10**-15)
+  /// * `a`     atto    (10**-18)
+  /// * `z`     zepto   (10**-21)
+  /// * `y`     yocto   (10**-24)
+  /// * `Ki`    kibi    (2**10)
+  /// * `Mi`    mebi    (2**20)
+  /// * `Gi`    gibi    (2**30)
+  /// * `Ti`    tebi    (2**40)
+  ///
+  /// **Grammar**
+  ///
+  /// The grammar also includes these connectors:
+  ///
+  /// * `/`    division (as an infix operator, e.g. `1/s`).
+  /// * `.`    multiplication (as an infix operator, e.g. `GBy.d`)
+  ///
+  /// The grammar for a unit is as follows:
+  ///
+  ///     Expression = Component { "." Component } { "/" Component } ;
+  ///
+  ///     Component = ( [ PREFIX ] UNIT | "%" ) [ Annotation ]
+  ///               | Annotation
+  ///               | "1"
+  ///               ;
+  ///
+  ///     Annotation = "{" NAME "}" ;
+  ///
+  /// Notes:
+  ///
+  /// * `Annotation` is just a comment if it follows a `UNIT` and is
+  ///    equivalent to `1` if it is used alone. For examples,
+  ///    `{requests}/s == 1/s`, `By{transmitted}/s == By/s`.
+  /// * `NAME` is a sequence of non-blank printable ASCII characters not
+  ///    containing '{' or '}'.
+  /// * `1` represents dimensionless value 1, such as in `1/s`.
+  /// * `%` represents dimensionless value 1/100, and annotates values giving
+  ///    a percentage.
+  core.String unit;
+
+  /// Whether the measurement is an integer, a floating-point number, etc.
+  /// Some combinations of `metric_kind` and `value_type` might not be
+  /// supported.
+  /// Possible string values are:
+  /// - "VALUE_TYPE_UNSPECIFIED" : Do not use this default value.
+  /// - "BOOL" : The value is a boolean.
+  /// This value type can be used only if the metric kind is `GAUGE`.
+  /// - "INT64" : The value is a signed 64-bit integer.
+  /// - "DOUBLE" : The value is a double precision floating point number.
+  /// - "STRING" : The value is a text string.
+  /// This value type can be used only if the metric kind is `GAUGE`.
+  /// - "DISTRIBUTION" : The value is a `Distribution`.
+  /// - "MONEY" : The value is money.
+  core.String valueType;
+
+  MetricDescriptor();
+
+  MetricDescriptor.fromJson(core.Map _json) {
+    if (_json.containsKey("description")) {
+      description = _json["description"];
+    }
+    if (_json.containsKey("displayName")) {
+      displayName = _json["displayName"];
+    }
+    if (_json.containsKey("labels")) {
+      labels = (_json["labels"] as core.List)
+          .map<LabelDescriptor>((value) => new LabelDescriptor.fromJson(value))
+          .toList();
+    }
+    if (_json.containsKey("metadata")) {
+      metadata = new MetricDescriptorMetadata.fromJson(_json["metadata"]);
+    }
+    if (_json.containsKey("metricKind")) {
+      metricKind = _json["metricKind"];
+    }
+    if (_json.containsKey("name")) {
+      name = _json["name"];
+    }
+    if (_json.containsKey("type")) {
+      type = _json["type"];
+    }
+    if (_json.containsKey("unit")) {
+      unit = _json["unit"];
+    }
+    if (_json.containsKey("valueType")) {
+      valueType = _json["valueType"];
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (description != null) {
+      _json["description"] = description;
+    }
+    if (displayName != null) {
+      _json["displayName"] = displayName;
+    }
+    if (labels != null) {
+      _json["labels"] = labels.map((value) => (value).toJson()).toList();
+    }
+    if (metadata != null) {
+      _json["metadata"] = (metadata).toJson();
+    }
+    if (metricKind != null) {
+      _json["metricKind"] = metricKind;
+    }
+    if (name != null) {
+      _json["name"] = name;
+    }
+    if (type != null) {
+      _json["type"] = type;
+    }
+    if (unit != null) {
+      _json["unit"] = unit;
+    }
+    if (valueType != null) {
+      _json["valueType"] = valueType;
+    }
+    return _json;
+  }
+}
+
+/// Additional annotations that can be used to guide the usage of a metric.
+class MetricDescriptorMetadata {
+  /// The delay of data points caused by ingestion. Data points older than this
+  /// age are guaranteed to be ingested and available to be read, excluding
+  /// data loss due to errors.
+  core.String ingestDelay;
+
+  /// The launch stage of the metric definition.
+  /// Possible string values are:
+  /// - "LAUNCH_STAGE_UNSPECIFIED" : Do not use this default value.
+  /// - "EARLY_ACCESS" : Early Access features are limited to a closed group of
+  /// testers. To use
+  /// these features, you must sign up in advance and sign a Trusted Tester
+  /// agreement (which includes confidentiality provisions). These features may
+  /// be unstable, changed in backward-incompatible ways, and are not
+  /// guaranteed to be released.
+  /// - "ALPHA" : Alpha is a limited availability test for releases before they
+  /// are cleared
+  /// for widespread use. By Alpha, all significant design issues are resolved
+  /// and we are in the process of verifying functionality. Alpha customers
+  /// need to apply for access, agree to applicable terms, and have their
+  /// projects whitelisted. Alpha releases don’t have to be feature complete,
+  /// no SLAs are provided, and there are no technical support obligations, but
+  /// they will be far enough along that customers can actually use them in
+  /// test environments or for limited-use tests -- just like they would in
+  /// normal production cases.
+  /// - "BETA" : Beta is the point at which we are ready to open a release for
+  /// any
+  /// customer to use. There are no SLA or technical support obligations in a
+  /// Beta release. Products will be complete from a feature perspective, but
+  /// may have some open outstanding issues. Beta releases are suitable for
+  /// limited production use cases.
+  /// - "GA" : GA features are open to all developers and are considered stable
+  /// and
+  /// fully qualified for production use.
+  /// - "DEPRECATED" : Deprecated features are scheduled to be shut down and
+  /// removed. For more
+  /// information, see the “Deprecation Policy” section of our [Terms of
+  /// Service](https://cloud.google.com/terms/)
+  /// and the [Google Cloud Platform Subject to the Deprecation
+  /// Policy](https://cloud.google.com/terms/deprecation) documentation.
+  core.String launchStage;
+
+  /// The sampling period of metric data points. For metrics which are written
+  /// periodically, consecutive data points are stored at this time interval,
+  /// excluding data loss due to errors. Metrics with a higher granularity have
+  /// a smaller sampling period.
+  core.String samplePeriod;
+
+  MetricDescriptorMetadata();
+
+  MetricDescriptorMetadata.fromJson(core.Map _json) {
+    if (_json.containsKey("ingestDelay")) {
+      ingestDelay = _json["ingestDelay"];
+    }
+    if (_json.containsKey("launchStage")) {
+      launchStage = _json["launchStage"];
+    }
+    if (_json.containsKey("samplePeriod")) {
+      samplePeriod = _json["samplePeriod"];
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (ingestDelay != null) {
+      _json["ingestDelay"] = ingestDelay;
+    }
+    if (launchStage != null) {
+      _json["launchStage"] = launchStage;
+    }
+    if (samplePeriod != null) {
+      _json["samplePeriod"] = samplePeriod;
+    }
+    return _json;
+  }
+}
+
+/// Bind API methods to metrics. Binding a method to a metric causes that
+/// metric's configured quota behaviors to apply to the method call.
+class MetricRule {
+  /// Metrics to update when the selected methods are called, and the associated
+  /// cost applied to each metric.
+  ///
+  /// The key of the map is the metric name, and the values are the amount
+  /// increased for the metric against which the quota limits are defined.
+  /// The value must not be negative.
+  core.Map<core.String, core.String> metricCosts;
+
+  /// Selects the methods to which this rule applies.
+  ///
+  /// Refer to selector for syntax details.
+  core.String selector;
+
+  MetricRule();
+
+  MetricRule.fromJson(core.Map _json) {
+    if (_json.containsKey("metricCosts")) {
+      metricCosts =
+          (_json["metricCosts"] as core.Map).cast<core.String, core.String>();
+    }
+    if (_json.containsKey("selector")) {
+      selector = _json["selector"];
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (metricCosts != null) {
+      _json["metricCosts"] = metricCosts;
+    }
+    if (selector != null) {
+      _json["selector"] = selector;
+    }
+    return _json;
+  }
+}
+
+/// Declares an API Interface to be included in this interface. The including
+/// interface must redeclare all the methods from the included interface, but
+/// documentation and options are inherited as follows:
+///
+/// - If after comment and whitespace stripping, the documentation
+///   string of the redeclared method is empty, it will be inherited
+///   from the original method.
+///
+/// - Each annotation belonging to the service config (http,
+///   visibility) which is not set in the redeclared method will be
+///   inherited.
+///
+/// - If an http annotation is inherited, the path pattern will be
+///   modified as follows. Any version prefix will be replaced by the
+///   version of the including interface plus the root path if
+///   specified.
+///
+/// Example of a simple mixin:
+///
+///     package google.acl.v1;
+///     service AccessControl {
+///       // Get the underlying ACL object.
+///       rpc GetAcl(GetAclRequest) returns (Acl) {
+///         option (google.api.http).get = "/v1/{resource=**}:getAcl";
+///       }
+///     }
+///
+///     package google.storage.v2;
+///     service Storage {
+///       //       rpc GetAcl(GetAclRequest) returns (Acl);
+///
+///       // Get a data record.
+///       rpc GetData(GetDataRequest) returns (Data) {
+///         option (google.api.http).get = "/v2/{resource=**}";
+///       }
+///     }
+///
+/// Example of a mixin configuration:
+///
+///     apis:
+///     - name: google.storage.v2.Storage
+///       mixins:
+///       - name: google.acl.v1.AccessControl
+///
+/// The mixin construct implies that all methods in `AccessControl` are
+/// also declared with same name and request/response types in
+/// `Storage`. A documentation generator or annotation processor will
+/// see the effective `Storage.GetAcl` method after inherting
+/// documentation and annotations as follows:
+///
+///     service Storage {
+///       // Get the underlying ACL object.
+///       rpc GetAcl(GetAclRequest) returns (Acl) {
+///         option (google.api.http).get = "/v2/{resource=**}:getAcl";
+///       }
+///       ...
+///     }
+///
+/// Note how the version in the path pattern changed from `v1` to `v2`.
+///
+/// If the `root` field in the mixin is specified, it should be a
+/// relative path under which inherited HTTP paths are placed. Example:
+///
+///     apis:
+///     - name: google.storage.v2.Storage
+///       mixins:
+///       - name: google.acl.v1.AccessControl
+///         root: acls
+///
+/// This implies the following inherited HTTP annotation:
+///
+///     service Storage {
+///       // Get the underlying ACL object.
+///       rpc GetAcl(GetAclRequest) returns (Acl) {
+///         option (google.api.http).get = "/v2/acls/{resource=**}:getAcl";
+///       }
+///       ...
+///     }
+class Mixin {
+  /// The fully qualified name of the interface which is included.
+  core.String name;
+
+  /// If non-empty specifies a path under which inherited HTTP paths
+  /// are rooted.
+  core.String root;
+
+  Mixin();
+
+  Mixin.fromJson(core.Map _json) {
+    if (_json.containsKey("name")) {
+      name = _json["name"];
+    }
+    if (_json.containsKey("root")) {
+      root = _json["root"];
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (name != null) {
+      _json["name"] = name;
+    }
+    if (root != null) {
+      _json["root"] = root;
+    }
+    return _json;
+  }
+}
+
+/// An object that describes the schema of a MonitoredResource object using a
+/// type name and a set of labels.  For example, the monitored resource
+/// descriptor for Google Compute Engine VM instances has a type of
+/// `"gce_instance"` and specifies the use of the labels `"instance_id"` and
+/// `"zone"` to identify particular VM instances.
+///
+/// Different APIs can support different monitored resource types. APIs
+/// generally
+/// provide a `list` method that returns the monitored resource descriptors used
+/// by the API.
+class MonitoredResourceDescriptor {
+  /// Optional. A detailed description of the monitored resource type that might
+  /// be used in documentation.
+  core.String description;
+
+  /// Optional. A concise name for the monitored resource type that might be
+  /// displayed in user interfaces. It should be a Title Cased Noun Phrase,
+  /// without any article or other determiners. For example,
+  /// `"Google Cloud SQL Database"`.
+  core.String displayName;
+
+  /// Required. A set of labels used to describe instances of this monitored
+  /// resource type. For example, an individual Google Cloud SQL database is
+  /// identified by values for the labels `"database_id"` and `"zone"`.
+  core.List<LabelDescriptor> labels;
+
+  /// Optional. The resource name of the monitored resource descriptor:
+  /// `"projects/{project_id}/monitoredResourceDescriptors/{type}"` where
+  /// {type} is the value of the `type` field in this object and
+  /// {project_id} is a project ID that provides API-specific context for
+  /// accessing the type.  APIs that do not use project information can use the
+  /// resource name format `"monitoredResourceDescriptors/{type}"`.
+  core.String name;
+
+  /// Required. The monitored resource type. For example, the type
+  /// `"cloudsql_database"` represents databases in Google Cloud SQL.
+  /// The maximum length of this value is 256 characters.
+  core.String type;
+
+  MonitoredResourceDescriptor();
+
+  MonitoredResourceDescriptor.fromJson(core.Map _json) {
+    if (_json.containsKey("description")) {
+      description = _json["description"];
+    }
+    if (_json.containsKey("displayName")) {
+      displayName = _json["displayName"];
+    }
+    if (_json.containsKey("labels")) {
+      labels = (_json["labels"] as core.List)
+          .map<LabelDescriptor>((value) => new LabelDescriptor.fromJson(value))
+          .toList();
+    }
+    if (_json.containsKey("name")) {
+      name = _json["name"];
+    }
+    if (_json.containsKey("type")) {
+      type = _json["type"];
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (description != null) {
+      _json["description"] = description;
+    }
+    if (displayName != null) {
+      _json["displayName"] = displayName;
+    }
+    if (labels != null) {
+      _json["labels"] = labels.map((value) => (value).toJson()).toList();
+    }
+    if (name != null) {
+      _json["name"] = name;
+    }
+    if (type != null) {
+      _json["type"] = type;
+    }
+    return _json;
+  }
+}
+
+/// Monitoring configuration of the service.
+///
+/// The example below shows how to configure monitored resources and metrics
+/// for monitoring. In the example, a monitored resource and two metrics are
+/// defined. The `library.googleapis.com/book/returned_count` metric is sent
+/// to both producer and consumer projects, whereas the
+/// `library.googleapis.com/book/overdue_count` metric is only sent to the
+/// consumer project.
+///
+///     monitored_resources:
+///     - type: library.googleapis.com/branch
+///       labels:
+///       - key: /city
+///         description: The city where the library branch is located in.
+///       - key: /name
+///         description: The name of the branch.
+///     metrics:
+///     - name: library.googleapis.com/book/returned_count
+///       metric_kind: DELTA
+///       value_type: INT64
+///       labels:
+///       - key: /customer_id
+///     - name: library.googleapis.com/book/overdue_count
+///       metric_kind: GAUGE
+///       value_type: INT64
+///       labels:
+///       - key: /customer_id
+///     monitoring:
+///       producer_destinations:
+///       - monitored_resource: library.googleapis.com/branch
+///         metrics:
+///         - library.googleapis.com/book/returned_count
+///       consumer_destinations:
+///       - monitored_resource: library.googleapis.com/branch
+///         metrics:
+///         - library.googleapis.com/book/returned_count
+///         - library.googleapis.com/book/overdue_count
+class Monitoring {
+  /// Monitoring configurations for sending metrics to the consumer project.
+  /// There can be multiple consumer destinations, each one must have a
+  /// different monitored resource type. A metric can be used in at most
+  /// one consumer destination.
+  core.List<MonitoringDestination> consumerDestinations;
+
+  /// Monitoring configurations for sending metrics to the producer project.
+  /// There can be multiple producer destinations, each one must have a
+  /// different monitored resource type. A metric can be used in at most
+  /// one producer destination.
+  core.List<MonitoringDestination> producerDestinations;
+
+  Monitoring();
+
+  Monitoring.fromJson(core.Map _json) {
+    if (_json.containsKey("consumerDestinations")) {
+      consumerDestinations = (_json["consumerDestinations"] as core.List)
+          .map<MonitoringDestination>(
+              (value) => new MonitoringDestination.fromJson(value))
+          .toList();
+    }
+    if (_json.containsKey("producerDestinations")) {
+      producerDestinations = (_json["producerDestinations"] as core.List)
+          .map<MonitoringDestination>(
+              (value) => new MonitoringDestination.fromJson(value))
+          .toList();
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (consumerDestinations != null) {
+      _json["consumerDestinations"] =
+          consumerDestinations.map((value) => (value).toJson()).toList();
+    }
+    if (producerDestinations != null) {
+      _json["producerDestinations"] =
+          producerDestinations.map((value) => (value).toJson()).toList();
+    }
+    return _json;
+  }
+}
+
+/// Configuration of a specific monitoring destination (the producer project
+/// or the consumer project).
+class MonitoringDestination {
+  /// Names of the metrics to report to this monitoring destination.
+  /// Each name must be defined in Service.metrics section.
+  core.List<core.String> metrics;
+
+  /// The monitored resource type. The type must be defined in
+  /// Service.monitored_resources section.
+  core.String monitoredResource;
+
+  MonitoringDestination();
+
+  MonitoringDestination.fromJson(core.Map _json) {
+    if (_json.containsKey("metrics")) {
+      metrics = (_json["metrics"] as core.List).cast<core.String>();
+    }
+    if (_json.containsKey("monitoredResource")) {
+      monitoredResource = _json["monitoredResource"];
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (metrics != null) {
+      _json["metrics"] = metrics;
+    }
+    if (monitoredResource != null) {
+      _json["monitoredResource"] = monitoredResource;
+    }
+    return _json;
+  }
+}
+
+/// OAuth scopes are a way to define data and permissions on data. For example,
+/// there are scopes defined for "Read-only access to Google Calendar" and
+/// "Access to Cloud Platform". Users can consent to a scope for an application,
+/// giving it permission to access that data on their behalf.
+///
+/// OAuth scope specifications should be fairly coarse grained; a user will need
+/// to see and understand the text description of what your scope means.
+///
+/// In most cases: use one or at most two OAuth scopes for an entire family of
+/// products. If your product has multiple APIs, you should probably be sharing
+/// the OAuth scope across all of those APIs.
+///
+/// When you need finer grained OAuth consent screens: talk with your product
+/// management about how developers will use them in practice.
+///
+/// Please note that even though each of the canonical scopes is enough for a
+/// request to be accepted and passed to the backend, a request can still fail
+/// due to the backend requiring additional scopes or permissions.
+class OAuthRequirements {
+  /// The list of publicly documented OAuth scopes that are allowed access. An
+  /// OAuth token containing any of these scopes will be accepted.
+  ///
+  /// Example:
+  ///
+  ///      canonical_scopes: https://www.googleapis.com/auth/calendar,
+  ///                        https://www.googleapis.com/auth/calendar.read
+  core.String canonicalScopes;
+
+  OAuthRequirements();
+
+  OAuthRequirements.fromJson(core.Map _json) {
+    if (_json.containsKey("canonicalScopes")) {
+      canonicalScopes = _json["canonicalScopes"];
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (canonicalScopes != null) {
+      _json["canonicalScopes"] = canonicalScopes;
+    }
+    return _json;
+  }
+}
+
+/// This resource represents a long-running operation that is the result of a
+/// network API call.
+class Operation {
+  /// If the value is `false`, it means the operation is still in progress.
+  /// If `true`, the operation is completed, and either `error` or `response` is
+  /// available.
+  core.bool done;
+
+  /// The error result of the operation in case of failure or cancellation.
+  Status error;
+
+  /// Service-specific metadata associated with the operation.  It typically
+  /// contains progress information and common metadata such as create time.
+  /// Some services might not provide such metadata.  Any method that returns a
+  /// long-running operation should document the metadata type, if any.
+  ///
+  /// The values for Object must be JSON objects. It can consist of `num`,
+  /// `String`, `bool` and `null` as well as `Map` and `List` values.
+  core.Map<core.String, core.Object> metadata;
+
+  /// The server-assigned name, which is only unique within the same service
+  /// that
+  /// originally returns it. If you use the default HTTP mapping, the
+  /// `name` should have the format of `operations/some/unique/name`.
+  core.String name;
+
+  /// The normal response of the operation in case of success.  If the original
+  /// method returns no data on success, such as `Delete`, the response is
+  /// `google.protobuf.Empty`.  If the original method is standard
+  /// `Get`/`Create`/`Update`, the response should be the resource.  For other
+  /// methods, the response should have the type `XxxResponse`, where `Xxx`
+  /// is the original method name.  For example, if the original method name
+  /// is `TakeSnapshot()`, the inferred response type is
+  /// `TakeSnapshotResponse`.
+  ///
+  /// The values for Object must be JSON objects. It can consist of `num`,
+  /// `String`, `bool` and `null` as well as `Map` and `List` values.
+  core.Map<core.String, core.Object> response;
+
+  Operation();
+
+  Operation.fromJson(core.Map _json) {
+    if (_json.containsKey("done")) {
+      done = _json["done"];
+    }
+    if (_json.containsKey("error")) {
+      error = new Status.fromJson(_json["error"]);
+    }
+    if (_json.containsKey("metadata")) {
+      metadata =
+          (_json["metadata"] as core.Map).cast<core.String, core.Object>();
+    }
+    if (_json.containsKey("name")) {
+      name = _json["name"];
+    }
+    if (_json.containsKey("response")) {
+      response =
+          (_json["response"] as core.Map).cast<core.String, core.Object>();
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (done != null) {
+      _json["done"] = done;
+    }
+    if (error != null) {
+      _json["error"] = (error).toJson();
+    }
+    if (metadata != null) {
+      _json["metadata"] = metadata;
+    }
+    if (name != null) {
+      _json["name"] = name;
+    }
+    if (response != null) {
+      _json["response"] = response;
+    }
+    return _json;
+  }
+}
+
+/// The operation metadata returned for the batchend services operation.
+class OperationMetadata {
+  /// The full name of the resources that this operation is directly
+  /// associated with.
+  core.List<core.String> resourceNames;
+
+  OperationMetadata();
+
+  OperationMetadata.fromJson(core.Map _json) {
+    if (_json.containsKey("resourceNames")) {
+      resourceNames = (_json["resourceNames"] as core.List).cast<core.String>();
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (resourceNames != null) {
+      _json["resourceNames"] = resourceNames;
+    }
+    return _json;
+  }
+}
+
+/// A protocol buffer option, which can be attached to a message, field,
+/// enumeration, etc.
+class Option {
+  /// The option's name. For protobuf built-in options (options defined in
+  /// descriptor.proto), this is the short name. For example, `"map_entry"`.
+  /// For custom options, it should be the fully-qualified name. For example,
+  /// `"google.api.http"`.
+  core.String name;
+
+  /// The option's value packed in an Any message. If the value is a primitive,
+  /// the corresponding wrapper type defined in google/protobuf/wrappers.proto
+  /// should be used. If the value is an enum, it should be stored as an int32
+  /// value using the google.protobuf.Int32Value type.
+  ///
+  /// The values for Object must be JSON objects. It can consist of `num`,
+  /// `String`, `bool` and `null` as well as `Map` and `List` values.
+  core.Map<core.String, core.Object> value;
+
+  Option();
+
+  Option.fromJson(core.Map _json) {
+    if (_json.containsKey("name")) {
+      name = _json["name"];
+    }
+    if (_json.containsKey("value")) {
+      value = (_json["value"] as core.Map).cast<core.String, core.Object>();
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (name != null) {
+      _json["name"] = name;
+    }
+    if (value != null) {
+      _json["value"] = value;
+    }
+    return _json;
+  }
+}
+
+/// Represents a documentation page. A page can contain subpages to represent
+/// nested documentation set structure.
+class Page {
+  /// The Markdown content of the page. You can use <code>&#40;== include {path}
+  /// ==&#41;</code>
+  /// to include content from a Markdown file.
+  core.String content;
+
+  /// The name of the page. It will be used as an identity of the page to
+  /// generate URI of the page, text of the link to this page in navigation,
+  /// etc. The full page name (start from the root page name to this page
+  /// concatenated with `.`) can be used as reference to the page in your
+  /// documentation. For example:
+  /// <pre><code>pages:
+  /// - name: Tutorial
+  ///   content: &#40;== include tutorial.md ==&#41;
+  ///   subpages:
+  ///   - name: Java
+  ///     content: &#40;== include tutorial_java.md ==&#41;
+  /// </code></pre>
+  /// You can reference `Java` page using Markdown reference link syntax:
+  /// `Java`.
+  core.String name;
+
+  /// Subpages of this page. The order of subpages specified here will be
+  /// honored in the generated docset.
+  core.List<Page> subpages;
+
+  Page();
+
+  Page.fromJson(core.Map _json) {
+    if (_json.containsKey("content")) {
+      content = _json["content"];
+    }
+    if (_json.containsKey("name")) {
+      name = _json["name"];
+    }
+    if (_json.containsKey("subpages")) {
+      subpages = (_json["subpages"] as core.List)
+          .map<Page>((value) => new Page.fromJson(value))
+          .toList();
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (content != null) {
+      _json["content"] = content;
+    }
+    if (name != null) {
+      _json["name"] = name;
+    }
+    if (subpages != null) {
+      _json["subpages"] = subpages.map((value) => (value).toJson()).toList();
+    }
+    return _json;
+  }
+}
+
+/// Quota configuration helps to achieve fairness and budgeting in service
+/// usage.
+///
+/// The quota configuration works this way:
+/// - The service configuration defines a set of metrics.
+/// - For API calls, the quota.metric_rules maps methods to metrics with
+///   corresponding costs.
+/// - The quota.limits defines limits on the metrics, which will be used for
+///   quota checks at runtime.
+///
+/// An example quota configuration in yaml format:
+///
+///    quota:
+///
+///      - name: apiWriteQpsPerProject
+///        metric: library.googleapis.com/write_calls
+///        unit: "1/min/{project}"  # rate limit for consumer projects
+///        values:
+///          STANDARD: 10000
+///
+///
+///      # The metric rules bind all methods to the read_calls metric,
+///      # except for the UpdateBook and DeleteBook methods. These two methods
+///      # are mapped to the write_calls metric, with the UpdateBook method
+///      # consuming at twice rate as the DeleteBook method.
+///      metric_rules:
+///      - selector: "*"
+///        metric_costs:
+///          library.googleapis.com/read_calls: 1
+///      - selector: google.example.library.v1.LibraryService.UpdateBook
+///        metric_costs:
+///          library.googleapis.com/write_calls: 2
+///      - selector: google.example.library.v1.LibraryService.DeleteBook
+///        metric_costs:
+///          library.googleapis.com/write_calls: 1
+///
+///  Corresponding Metric definition:
+///
+///      metrics:
+///      - name: library.googleapis.com/read_calls
+///        display_name: Read requests
+///        metric_kind: DELTA
+///        value_type: INT64
+///
+///      - name: library.googleapis.com/write_calls
+///        display_name: Write requests
+///        metric_kind: DELTA
+///        value_type: INT64
+class Quota {
+  /// List of `QuotaLimit` definitions for the service.
+  core.List<QuotaLimit> limits;
+
+  /// List of `MetricRule` definitions, each one mapping a selected method to
+  /// one
+  /// or more metrics.
+  core.List<MetricRule> metricRules;
+
+  Quota();
+
+  Quota.fromJson(core.Map _json) {
+    if (_json.containsKey("limits")) {
+      limits = (_json["limits"] as core.List)
+          .map<QuotaLimit>((value) => new QuotaLimit.fromJson(value))
+          .toList();
+    }
+    if (_json.containsKey("metricRules")) {
+      metricRules = (_json["metricRules"] as core.List)
+          .map<MetricRule>((value) => new MetricRule.fromJson(value))
+          .toList();
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (limits != null) {
+      _json["limits"] = limits.map((value) => (value).toJson()).toList();
+    }
+    if (metricRules != null) {
+      _json["metricRules"] =
+          metricRules.map((value) => (value).toJson()).toList();
+    }
+    return _json;
+  }
+}
+
+/// `QuotaLimit` defines a specific limit that applies over a specified duration
+/// for a limit type. There can be at most one limit for a duration and limit
+/// type combination defined within a `QuotaGroup`.
+class QuotaLimit {
+  /// Default number of tokens that can be consumed during the specified
+  /// duration. This is the number of tokens assigned when a client
+  /// application developer activates the service for his/her project.
+  ///
+  /// Specifying a value of 0 will block all requests. This can be used if you
+  /// are provisioning quota to selected consumers and blocking others.
+  /// Similarly, a value of -1 will indicate an unlimited quota. No other
+  /// negative values are allowed.
+  ///
+  /// Used by group-based quotas only.
+  core.String defaultLimit;
+
+  /// Optional. User-visible, extended description for this quota limit.
+  /// Should be used only when more context is needed to understand this limit
+  /// than provided by the limit's display name (see: `display_name`).
+  core.String description;
+
+  /// User-visible display name for this limit.
+  /// Optional. If not set, the UI will provide a default display name based on
+  /// the quota configuration. This field can be used to override the default
+  /// display name generated from the configuration.
+  core.String displayName;
+
+  /// Duration of this limit in textual notation. Example: "100s", "24h", "1d".
+  /// For duration longer than a day, only multiple of days is supported. We
+  /// support only "100s" and "1d" for now. Additional support will be added in
+  /// the future. "0" indicates indefinite duration.
+  ///
+  /// Used by group-based quotas only.
+  core.String duration;
+
+  /// Free tier value displayed in the Developers Console for this limit.
+  /// The free tier is the number of tokens that will be subtracted from the
+  /// billed amount when billing is enabled.
+  /// This field can only be set on a limit with duration "1d", in a billable
+  /// group; it is invalid on any other limit. If this field is not set, it
+  /// defaults to 0, indicating that there is no free tier for this service.
+  ///
+  /// Used by group-based quotas only.
+  core.String freeTier;
+
+  /// Maximum number of tokens that can be consumed during the specified
+  /// duration. Client application developers can override the default limit up
+  /// to this maximum. If specified, this value cannot be set to a value less
+  /// than the default limit. If not specified, it is set to the default limit.
+  ///
+  /// To allow clients to apply overrides with no upper bound, set this to -1,
+  /// indicating unlimited maximum quota.
+  ///
+  /// Used by group-based quotas only.
+  core.String maxLimit;
+
+  /// The name of the metric this quota limit applies to. The quota limits with
+  /// the same metric will be checked together during runtime. The metric must
+  /// be
+  /// defined within the service config.
+  core.String metric;
+
+  /// Name of the quota limit.
+  ///
+  /// The name must be provided, and it must be unique within the service. The
+  /// name can only include alphanumeric characters as well as '-'.
+  ///
+  /// The maximum length of the limit name is 64 characters.
+  core.String name;
+
+  /// Specify the unit of the quota limit. It uses the same syntax as
+  /// Metric.unit. The supported unit kinds are determined by the quota
+  /// backend system.
+  ///
+  /// Here are some examples:
+  /// * "1/min/{project}" for quota per minute per project.
+  ///
+  /// Note: the order of unit components is insignificant.
+  /// The "1" at the beginning is required to follow the metric unit syntax.
+  core.String unit;
+
+  /// Tiered limit values. You must specify this as a key:value pair, with an
+  /// integer value that is the maximum number of requests allowed for the
+  /// specified unit. Currently only STANDARD is supported.
+  core.Map<core.String, core.String> values;
+
+  QuotaLimit();
+
+  QuotaLimit.fromJson(core.Map _json) {
+    if (_json.containsKey("defaultLimit")) {
+      defaultLimit = _json["defaultLimit"];
+    }
+    if (_json.containsKey("description")) {
+      description = _json["description"];
+    }
+    if (_json.containsKey("displayName")) {
+      displayName = _json["displayName"];
+    }
+    if (_json.containsKey("duration")) {
+      duration = _json["duration"];
+    }
+    if (_json.containsKey("freeTier")) {
+      freeTier = _json["freeTier"];
+    }
+    if (_json.containsKey("maxLimit")) {
+      maxLimit = _json["maxLimit"];
+    }
+    if (_json.containsKey("metric")) {
+      metric = _json["metric"];
+    }
+    if (_json.containsKey("name")) {
+      name = _json["name"];
+    }
+    if (_json.containsKey("unit")) {
+      unit = _json["unit"];
+    }
+    if (_json.containsKey("values")) {
+      values = (_json["values"] as core.Map).cast<core.String, core.String>();
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (defaultLimit != null) {
+      _json["defaultLimit"] = defaultLimit;
+    }
+    if (description != null) {
+      _json["description"] = description;
+    }
+    if (displayName != null) {
+      _json["displayName"] = displayName;
+    }
+    if (duration != null) {
+      _json["duration"] = duration;
+    }
+    if (freeTier != null) {
+      _json["freeTier"] = freeTier;
+    }
+    if (maxLimit != null) {
+      _json["maxLimit"] = maxLimit;
+    }
+    if (metric != null) {
+      _json["metric"] = metric;
+    }
+    if (name != null) {
+      _json["name"] = name;
+    }
+    if (unit != null) {
+      _json["unit"] = unit;
+    }
+    if (values != null) {
+      _json["values"] = values;
+    }
+    return _json;
+  }
+}
+
+/// `SourceContext` represents information about the source of a
+/// protobuf element, like the file in which it is defined.
+class SourceContext {
+  /// The path-qualified name of the .proto file that contained the associated
+  /// protobuf element.  For example: `"google/protobuf/source_context.proto"`.
+  core.String fileName;
+
+  SourceContext();
+
+  SourceContext.fromJson(core.Map _json) {
+    if (_json.containsKey("fileName")) {
+      fileName = _json["fileName"];
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (fileName != null) {
+      _json["fileName"] = fileName;
+    }
+    return _json;
+  }
+}
+
+/// Source information used to create a Service Config
+class SourceInfo {
+  /// All files used during config generation.
+  ///
+  /// The values for Object must be JSON objects. It can consist of `num`,
+  /// `String`, `bool` and `null` as well as `Map` and `List` values.
+  core.List<core.Map<core.String, core.Object>> sourceFiles;
+
+  SourceInfo();
+
+  SourceInfo.fromJson(core.Map _json) {
+    if (_json.containsKey("sourceFiles")) {
+      sourceFiles = (_json["sourceFiles"] as core.List)
+          .map<core.Map<core.String, core.Object>>(
+              (value) => (value as core.Map).cast<core.String, core.Object>())
+          .toList();
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (sourceFiles != null) {
+      _json["sourceFiles"] = sourceFiles;
+    }
+    return _json;
+  }
+}
+
+/// The `Status` type defines a logical error model that is suitable for
+/// different
+/// programming environments, including REST APIs and RPC APIs. It is used by
+/// [gRPC](https://github.com/grpc). The error model is designed to be:
+///
+/// - Simple to use and understand for most users
+/// - Flexible enough to meet unexpected needs
+///
+/// # Overview
+///
+/// The `Status` message contains three pieces of data: error code, error
+/// message,
+/// and error details. The error code should be an enum value of
+/// google.rpc.Code, but it may accept additional error codes if needed.  The
+/// error message should be a developer-facing English message that helps
+/// developers *understand* and *resolve* the error. If a localized user-facing
+/// error message is needed, put the localized message in the error details or
+/// localize it in the client. The optional error details may contain arbitrary
+/// information about the error. There is a predefined set of error detail types
+/// in the package `google.rpc` that can be used for common error conditions.
+///
+/// # Language mapping
+///
+/// The `Status` message is the logical representation of the error model, but
+/// it
+/// is not necessarily the actual wire format. When the `Status` message is
+/// exposed in different client libraries and different wire protocols, it can
+/// be
+/// mapped differently. For example, it will likely be mapped to some exceptions
+/// in Java, but more likely mapped to some error codes in C.
+///
+/// # Other uses
+///
+/// The error model and the `Status` message can be used in a variety of
+/// environments, either with or without APIs, to provide a
+/// consistent developer experience across different environments.
+///
+/// Example uses of this error model include:
+///
+/// - Partial errors. If a service needs to return partial errors to the client,
+/// it may embed the `Status` in the normal response to indicate the partial
+///     errors.
+///
+/// - Workflow errors. A typical workflow has multiple steps. Each step may
+///     have a `Status` message for error reporting.
+///
+/// - Batch operations. If a client uses batch request and batch response, the
+///     `Status` message should be used directly inside batch response, one for
+///     each error sub-response.
+///
+/// - Asynchronous operations. If an API call embeds asynchronous operation
+///     results in its response, the status of those operations should be
+///     represented directly using the `Status` message.
+///
+/// - Logging. If some API errors are stored in logs, the message `Status` could
+/// be used directly after any stripping needed for security/privacy reasons.
+class Status {
+  /// The status code, which should be an enum value of google.rpc.Code.
+  core.int code;
+
+  /// A list of messages that carry the error details.  There is a common set of
+  /// message types for APIs to use.
+  ///
+  /// The values for Object must be JSON objects. It can consist of `num`,
+  /// `String`, `bool` and `null` as well as `Map` and `List` values.
+  core.List<core.Map<core.String, core.Object>> details;
+
+  /// A developer-facing error message, which should be in English. Any
+  /// user-facing error message should be localized and sent in the
+  /// google.rpc.Status.details field, or localized by the client.
+  core.String message;
+
+  Status();
+
+  Status.fromJson(core.Map _json) {
+    if (_json.containsKey("code")) {
+      code = _json["code"];
+    }
+    if (_json.containsKey("details")) {
+      details = (_json["details"] as core.List)
+          .map<core.Map<core.String, core.Object>>(
+              (value) => (value as core.Map).cast<core.String, core.Object>())
+          .toList();
+    }
+    if (_json.containsKey("message")) {
+      message = _json["message"];
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (code != null) {
+      _json["code"] = code;
+    }
+    if (details != null) {
+      _json["details"] = details;
+    }
+    if (message != null) {
+      _json["message"] = message;
+    }
+    return _json;
+  }
+}
+
+/// Define a parameter's name and location. The parameter may be passed as
+/// either
+/// an HTTP header or a URL query parameter, and if both are passed the behavior
+/// is implementation-dependent.
+class SystemParameter {
+  /// Define the HTTP header name to use for the parameter. It is case
+  /// insensitive.
+  core.String httpHeader;
+
+  /// Define the name of the parameter, such as "api_key" . It is case
+  /// sensitive.
+  core.String name;
+
+  /// Define the URL query parameter name to use for the parameter. It is case
+  /// sensitive.
+  core.String urlQueryParameter;
+
+  SystemParameter();
+
+  SystemParameter.fromJson(core.Map _json) {
+    if (_json.containsKey("httpHeader")) {
+      httpHeader = _json["httpHeader"];
+    }
+    if (_json.containsKey("name")) {
+      name = _json["name"];
+    }
+    if (_json.containsKey("urlQueryParameter")) {
+      urlQueryParameter = _json["urlQueryParameter"];
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (httpHeader != null) {
+      _json["httpHeader"] = httpHeader;
+    }
+    if (name != null) {
+      _json["name"] = name;
+    }
+    if (urlQueryParameter != null) {
+      _json["urlQueryParameter"] = urlQueryParameter;
+    }
+    return _json;
+  }
+}
+
+/// Define a system parameter rule mapping system parameter definitions to
+/// methods.
+class SystemParameterRule {
+  /// Define parameters. Multiple names may be defined for a parameter.
+  /// For a given method call, only one of them should be used. If multiple
+  /// names are used the behavior is implementation-dependent.
+  /// If none of the specified names are present the behavior is
+  /// parameter-dependent.
+  core.List<SystemParameter> parameters;
+
+  /// Selects the methods to which this rule applies. Use '*' to indicate all
+  /// methods in all APIs.
+  ///
+  /// Refer to selector for syntax details.
+  core.String selector;
+
+  SystemParameterRule();
+
+  SystemParameterRule.fromJson(core.Map _json) {
+    if (_json.containsKey("parameters")) {
+      parameters = (_json["parameters"] as core.List)
+          .map<SystemParameter>((value) => new SystemParameter.fromJson(value))
+          .toList();
+    }
+    if (_json.containsKey("selector")) {
+      selector = _json["selector"];
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (parameters != null) {
+      _json["parameters"] =
+          parameters.map((value) => (value).toJson()).toList();
+    }
+    if (selector != null) {
+      _json["selector"] = selector;
+    }
+    return _json;
+  }
+}
+
+/// ### System parameter configuration
+///
+/// A system parameter is a special kind of parameter defined by the API
+/// system, not by an individual API. It is typically mapped to an HTTP header
+/// and/or a URL query parameter. This configuration specifies which methods
+/// change the names of the system parameters.
+class SystemParameters {
+  /// Define system parameters.
+  ///
+  /// The parameters defined here will override the default parameters
+  /// implemented by the system. If this field is missing from the service
+  /// config, default system parameters will be used. Default system parameters
+  /// and names is implementation-dependent.
+  ///
+  /// Example: define api key for all methods
+  ///
+  ///     system_parameters
+  ///       rules:
+  ///         - selector: "*"
+  ///           parameters:
+  ///             - name: api_key
+  ///               url_query_parameter: api_key
+  ///
+  ///
+  /// Example: define 2 api key names for a specific method.
+  ///
+  ///     system_parameters
+  ///       rules:
+  ///         - selector: "/ListShelves"
+  ///           parameters:
+  ///             - name: api_key
+  ///               http_header: Api-Key1
+  ///             - name: api_key
+  ///               http_header: Api-Key2
+  ///
+  /// **NOTE:** All service configuration rules follow "last one wins" order.
+  core.List<SystemParameterRule> rules;
+
+  SystemParameters();
+
+  SystemParameters.fromJson(core.Map _json) {
+    if (_json.containsKey("rules")) {
+      rules = (_json["rules"] as core.List)
+          .map<SystemParameterRule>(
+              (value) => new SystemParameterRule.fromJson(value))
+          .toList();
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (rules != null) {
+      _json["rules"] = rules.map((value) => (value).toJson()).toList();
+    }
+    return _json;
+  }
+}
+
+/// A protocol buffer message type.
+class Type {
+  /// The list of fields.
+  core.List<Field> fields;
+
+  /// The fully qualified message name.
+  core.String name;
+
+  /// The list of types appearing in `oneof` definitions in this type.
+  core.List<core.String> oneofs;
+
+  /// The protocol buffer options.
+  core.List<Option> options;
+
+  /// The source context.
+  SourceContext sourceContext;
+
+  /// The source syntax.
+  /// Possible string values are:
+  /// - "SYNTAX_PROTO2" : Syntax `proto2`.
+  /// - "SYNTAX_PROTO3" : Syntax `proto3`.
+  core.String syntax;
+
+  Type();
+
+  Type.fromJson(core.Map _json) {
+    if (_json.containsKey("fields")) {
+      fields = (_json["fields"] as core.List)
+          .map<Field>((value) => new Field.fromJson(value))
+          .toList();
+    }
+    if (_json.containsKey("name")) {
+      name = _json["name"];
+    }
+    if (_json.containsKey("oneofs")) {
+      oneofs = (_json["oneofs"] as core.List).cast<core.String>();
+    }
+    if (_json.containsKey("options")) {
+      options = (_json["options"] as core.List)
+          .map<Option>((value) => new Option.fromJson(value))
+          .toList();
+    }
+    if (_json.containsKey("sourceContext")) {
+      sourceContext = new SourceContext.fromJson(_json["sourceContext"]);
+    }
+    if (_json.containsKey("syntax")) {
+      syntax = _json["syntax"];
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (fields != null) {
+      _json["fields"] = fields.map((value) => (value).toJson()).toList();
+    }
+    if (name != null) {
+      _json["name"] = name;
+    }
+    if (oneofs != null) {
+      _json["oneofs"] = oneofs;
+    }
+    if (options != null) {
+      _json["options"] = options.map((value) => (value).toJson()).toList();
+    }
+    if (sourceContext != null) {
+      _json["sourceContext"] = (sourceContext).toJson();
+    }
+    if (syntax != null) {
+      _json["syntax"] = syntax;
+    }
+    return _json;
+  }
+}
+
+/// Configuration controlling usage of a service.
+class Usage {
+  /// The full resource name of a channel used for sending notifications to the
+  /// service producer.
+  ///
+  /// Google Service Management currently only supports
+  /// [Google Cloud Pub/Sub](https://cloud.google.com/pubsub) as a notification
+  /// channel. To use Google Cloud Pub/Sub as the channel, this must be the name
+  /// of a Cloud Pub/Sub topic that uses the Cloud Pub/Sub topic name format
+  /// documented in https://cloud.google.com/pubsub/docs/overview.
+  core.String producerNotificationChannel;
+
+  /// Requirements that must be satisfied before a consumer project can use the
+  /// service. Each requirement is of the form <service.name>/<requirement-id>;
+  /// for example 'serviceusage.googleapis.com/billing-enabled'.
+  core.List<core.String> requirements;
+
+  /// A list of usage rules that apply to individual API methods.
+  ///
+  /// **NOTE:** All service configuration rules follow "last one wins" order.
+  core.List<UsageRule> rules;
+
+  Usage();
+
+  Usage.fromJson(core.Map _json) {
+    if (_json.containsKey("producerNotificationChannel")) {
+      producerNotificationChannel = _json["producerNotificationChannel"];
+    }
+    if (_json.containsKey("requirements")) {
+      requirements = (_json["requirements"] as core.List).cast<core.String>();
+    }
+    if (_json.containsKey("rules")) {
+      rules = (_json["rules"] as core.List)
+          .map<UsageRule>((value) => new UsageRule.fromJson(value))
+          .toList();
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (producerNotificationChannel != null) {
+      _json["producerNotificationChannel"] = producerNotificationChannel;
+    }
+    if (requirements != null) {
+      _json["requirements"] = requirements;
+    }
+    if (rules != null) {
+      _json["rules"] = rules.map((value) => (value).toJson()).toList();
+    }
+    return _json;
+  }
+}
+
+/// Usage configuration rules for the service.
+///
+/// NOTE: Under development.
+///
+///
+/// Use this rule to configure unregistered calls for the service. Unregistered
+/// calls are calls that do not contain consumer project identity.
+/// (Example: calls that do not contain an API key).
+/// By default, API methods do not allow unregistered calls, and each method
+/// call
+/// must be identified by a consumer project identity. Use this rule to
+/// allow/disallow unregistered calls.
+///
+/// Example of an API that wants to allow unregistered calls for entire service.
+///
+///     usage:
+///       rules:
+///       - selector: "*"
+///         allow_unregistered_calls: true
+///
+/// Example of a method that wants to allow unregistered calls.
+///
+///     usage:
+///       rules:
+///       - selector: "google.example.library.v1.LibraryService.CreateBook"
+///         allow_unregistered_calls: true
+class UsageRule {
+  /// If true, the selected method allows unregistered calls, e.g. calls
+  /// that don't identify any user or application.
+  core.bool allowUnregisteredCalls;
+
+  /// Selects the methods to which this rule applies. Use '*' to indicate all
+  /// methods in all APIs.
+  ///
+  /// Refer to selector for syntax details.
+  core.String selector;
+
+  /// If true, the selected method should skip service control and the control
+  /// plane features, such as quota and billing, will not be available.
+  /// This flag is used by Google Cloud Endpoints to bypass checks for internal
+  /// methods, such as service health check methods.
+  core.bool skipServiceControl;
+
+  UsageRule();
+
+  UsageRule.fromJson(core.Map _json) {
+    if (_json.containsKey("allowUnregisteredCalls")) {
+      allowUnregisteredCalls = _json["allowUnregisteredCalls"];
+    }
+    if (_json.containsKey("selector")) {
+      selector = _json["selector"];
+    }
+    if (_json.containsKey("skipServiceControl")) {
+      skipServiceControl = _json["skipServiceControl"];
+    }
+  }
+
+  core.Map<core.String, core.Object> toJson() {
+    final core.Map<core.String, core.Object> _json =
+        new core.Map<core.String, core.Object>();
+    if (allowUnregisteredCalls != null) {
+      _json["allowUnregisteredCalls"] = allowUnregisteredCalls;
+    }
+    if (selector != null) {
+      _json["selector"] = selector;
+    }
+    if (skipServiceControl != null) {
+      _json["skipServiceControl"] = skipServiceControl;
+    }
+    return _json;
+  }
+}