| 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]+ | |