@abc.abstractmethod<EOL><INDENT>def add_root_catalog(self, catalog_id):<DEDENT>
pass<EOL>
Adds a root catalog.

        :param catalog_id: the ``Id`` of a catalog
        :type catalog_id: ``osid.id.Id``
        :raise: ``AlreadyExists`` -- ``catalog_id`` is already in hierarchy
        :raise: ``NotFound`` -- ``catalog_id`` not found
        :raise: ``NullArgument`` -- ``catalog_id`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure occurred

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