@abc.abstractmethod<EOL><INDENT>def is_member(self, member_resource_id, resource_id):<DEDENT>
return<EOL>
Tests if a ``Resource`` is a member of another ``Resource``.

        :param member_resource_id: ``Id`` of the ``Resource`` member
        :type member_resource_id: ``osid.id.Id``
        :param resource_id: ``Id`` of the ``Resource`` representing the group or demographic
        :type resource_id: ``osid.id.Id``
        :return: true if ``member_resource_id`` is a member of the ``resource_id,`` false otherwise
        :rtype: ``boolean``
        :raise: ``NullArgument`` -- ``member_resource_id`` or ``resource_id`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

        *compliance: mandatory -- This method must be implemented.*