@abc.abstractmethod<EOL><INDENT>def get_resource_relationships_by_genus_type(self, relationship_genus_type):<DEDENT>
return<EOL>
Gets the resource relationships for the given resource relationship genus type.

        :param relationship_genus_type: a relationship genus type
        :type relationship_genus_type: ``osid.type.Type``
        :return: the relationships
        :rtype: ``osid.resource.ResourceRelationshipList``
        :raise: ``NullArgument`` -- ``relationship_genus_type`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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