or separators])

          HTTPMethod ::= "GET" | "POST" | "PUT" | "DELETE" | "HEAD" |
                   "OPTIONS" | "TRACE" | ExtensionMethod

          HTTPMethodList ::= HTTPMethod | HTTPMethodList comma HTTPMethod

          HTTPMethodExceptionList ::= exclaimationPoint HTTPMethodList

          HTTPMethodSpec ::= null | HTTPMethodExceptionList |
                   HTTPMethodList

 </pre>

 <p>
 If duplicates occur in the HTTPMethodSpec they must be eliminated by the permission constructor.

 <p>
 A nu