| 1 | (* https://bottlecaps.de/rr/ui *)
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| 2 |
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| 3 | Definition
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| 4 | ::= PropertyName ( '=' Value )? ( ',' PropertyName ( '=' Value )? )*
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| 5 | Query ::= PropertyQuery ( ',' PropertyQuery )*
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| 6 | PropertyQuery ::= '-' PropertyName
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| 7 | | '?'? ( PropertyName (( '=' | '!=' ) Value)?)
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| 8 | Value ::= NumberLiteral
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| 9 | | StringLiteral
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| 10 | StringLiteral ::= QuotedString | UnquotedString
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| 11 | QuotedString ::= '"' [^"]* '"'
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| 12 | | "'" [^']* "'"
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| 13 | UnquotedString ::= [^{space},]+
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| 14 | NumberLiteral
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| 15 | ::= '0' ( [0-7]* | 'x' [0-9A-Fa-f]+ )
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| 16 | | '-'? [1-9] [0-9]+
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| 17 | PropertyName
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| 18 | ::= [A-Z] [A-Z0-9_]* ( '.' [A-Z] [A-Z0-9_]* )*
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