@utilities.arguments_not_none<EOL><INDENT>def get_comments_by_genus_type(self, comment_genus_type):<DEDENT>
<EOL>collection = JSONClientValidated('<STR_LIT>',<EOL>collection='<STR_LIT>',<EOL>runtime=self._runtime)<EOL>result = collection.find(<EOL>dict({'<STR_LIT>': str(comment_genus_type)},<EOL>**self._view_filter())).sort('<STR_LIT>', DESCENDING)<EOL>return objects.CommentList(result, runtime=self._runtime, proxy=self._proxy)<EOL>
Gets a ``CommentList`` corresponding to the given comment genus ``Type`` which does not include comments of genus types derived from the specified ``Type``.

        arg:    comment_genus_type (osid.type.Type): a comment genus
                type
        return: (osid.commenting.CommentList) - the returned ``Comment``
                list
        raise:  NullArgument - ``comment_genus_type`` is ``null``
        raise:  OperationFailed - unable to complete request
        raise:  PermissionDenied - authorization failure
        *compliance: mandatory -- This method must be implemented.*