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(* 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_]* )*
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