crypto/property/properties.ebnf

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