@abc.abstractmethod<EOL><INDENT>def get_composition(self):<DEDENT>
return<EOL>
Gets the Composition corresponding to this asset.

        :return: the composiiton
        :rtype: ``osid.repository.Composition``
        :raise: ``IllegalState`` -- ``is_composition()`` is ``false``
        :raise: ``OperationFailed`` -- unable to complete request

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