--- /dev/null
+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]+