def get_asset_composition_design_session(self):
if not self.supports_asset_composition_design():<EOL><INDENT>raise Unimplemented()<EOL><DEDENT>try:<EOL><INDENT>from . import sessions<EOL><DEDENT>except ImportError:<EOL><INDENT>raise OperationFailed('<STR_LIT>')<EOL><DEDENT>try:<EOL><INDENT>session = sessions.AssetCompositionDesignSession(proxy=self._proxy,<EOL>runtime=self._runtime)<EOL><DEDENT>except AttributeError:<EOL><INDENT>raise OperationFailed('<STR_LIT>')<EOL><DEDENT>return session<EOL>
Gets the session for creating asset compositions.

        return: (osid.repository.AssetCompositionDesignSession) - an
                AssetCompositionDesignSession
        raise:  OperationFailed - unable to complete request
        raise:  Unimplemented - supports_asset_composition_design() is
                false
        compliance: optional - This method must be implemented if
                    supports_asset_composition_design() is true.