- range-set ::= range ( logical-or range ) *
- logical-or ::= ( ' ' ) * '||' ( ' ' ) *
- range ::= hyphen | simple ( ' ' simple ) * | ''
- hyphen ::= partial ' - ' partial
- simple ::= primitive | partial | tilde | caret
- primitive ::= ( '<' | '>' | '>=' | '<=' | '=' ) partial
- partial ::= xr ( '.' xr ( '.' xr qualifier ? )? )?
- xr ::= 'x' | 'X' | '*' | nr
- nr ::= '0' | [1-9] ( [0-9] ) *
- tilde ::= '~' partial
- caret ::= '^' partial
- qualifier ::= ( '-' pre )? ( '+' build )?
- pre ::= parts
- build ::= parts
- parts ::= part ( '.' part ) *
- part ::= nr | [-0-9A-Za-z]+
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