| (* https://bottlecaps.de/rr/ui *) |
| |
| Definition |
| ::= PropertyName ( '=' Value )? ( ',' PropertyName ( '=' Value )? )* |
| Query ::= PropertyQuery ( ',' PropertyQuery )* |
| PropertyQuery ::= '-' PropertyName |
| | '?'? ( PropertyName (( '=' | '!=' ) Value)?) |
| Value ::= NumberLiteral |
| | StringLiteral |
| StringLiteral ::= QuotedString | UnquotedString |
| QuotedString ::= '"' [^"]* '"' |
| | "'" [^']* "'" |
| UnquotedString ::= [^{space},]+ |
| NumberLiteral |
| ::= '0' ( [0-7]* | 'x' [0-9A-Fa-f]+ ) |
| | '-'? [1-9] [0-9]+ |
| PropertyName |
| ::= [A-Z] [A-Z0-9_]* ( '.' [A-Z] [A-Z0-9_]* )* |
