@abc.abstractmethod<EOL><INDENT>def search_among_resource_relationships(self, resource_relationship_ids):<DEDENT>
pass<EOL>
Execute this search among the given list of resource relationships.

        :param resource_relationship_ids: list of resource relationships
        :type resource_relationship_ids: ``osid.id.IdList``
        :raise: ``NullArgument`` -- ``resource_relationship_ids`` is ``null``

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