PKIX1 { }
DEFINITIONS IMPLICIT TAGS ::=
BEGIN
id-ce   keyIdentifier             [0] KeyIdentifieectKeyIdentifier ::= KeyIdentifier
id-ce-keyUsage OBJECT IDENTIFIER ::=  { id-ce 15 }
KeyUsage ::= BIT STRING {
     digitalSignature        (0),
     nonRe,
     notAfter        [fier
id-ce-keyUsage OBJECT IDENTIFIER ::=  { id-ce 15 }
KeyUsage ::= BIT STRING {
     digitalSignature        (0),
     nonRe,
     notAfter        [1]    all be present
IFIER ::=  {i d-ce 35 }
AuthorityKeyIdentifier ::= SEQUENCE {
      keyIdentifier          NCE SIZE (1..MAX) OF PolicyInformation
PolicyInformation ::= OPTIONAL {
     policyI$netifier   CertPolicyId,
     policyQualifiers   SEQUENCE SIZE (NAL }
   F