@abc.abstractmethod<EOL><INDENT>def has_child_repositories(self, repository_id):<DEDENT>
return<EOL>
Tests if a repository has any children.

        :param repository_id: a repository ``Id``
        :type repository_id: ``osid.id.Id``
        :return: ``true`` if the ``repository_id`` has children, ``false`` otherwise
        :rtype: ``boolean``
        :raise: ``NotFound`` -- ``repository_id`` not found
        :raise: ``NullArgument`` -- ``repository_id`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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