@abc.abstractmethod<EOL><INDENT>def create_resource_relationship(self, resource_relationship_form):<DEDENT>
return<EOL>
Creates a new ``ResourceRelationship``.

        :param resource_relationship_form: the form for this ``ResourceRelationship``
        :type resource_relationship_form: ``osid.resource.ResourceRelationshipForm``
        :return: the new ``ResourceRelationship``
        :rtype: ``osid.resource.ResourceRelationship``
        :raise: ``IllegalState`` -- ``resource_relationship_form`` already used in a create transaction
        :raise: ``InvalidArgument`` -- one or more of the form elements is invalid
        :raise: ``NullArgument`` -- ``resource_id, peer_resource_id`` or ``resource_relationship_form`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure
        :raise: ``Unsupported`` -- ``resource_relationship_form`` did not originate from ``get_resource_relationship_form_for_create()``

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