docs: @Override
      public Ref memberRef(Context cx, Object namespace, Object elem,
              int memberTypeFlags)
      {
          boolean attribute = (memberTypeFlags & Node.ATTRIBUTE_FLAG) != 0;
          boolean descendants = (memberTypeFlags & Node.DESCENDANTS_FLAG) != 0;
          XMLName rv = XMLName.create(lib.toNodeQName(cx, namespace, elem),
                  attribute, descendants);
          rv.initXMLObject(this);
          return rv;
      }