@utilities.arguments_not_none<EOL><INDENT>def get_composition_assets(self, composition_id):<DEDENT>
<EOL>collection = JSONClientValidated('<STR_LIT>',<EOL>collection='<STR_LIT>',<EOL>runtime=self._runtime)<EOL>composition = collection.find_one(<EOL>dict({'<STR_LIT>': ObjectId(composition_id.get_identifier())},<EOL>**self._view_filter()))<EOL>if '<STR_LIT>' not in composition:<EOL><INDENT>raise errors.NotFound('<STR_LIT>')<EOL><DEDENT>asset_ids = []<EOL>for idstr in composition['<STR_LIT>']:<EOL><INDENT>asset_ids.append(Id(idstr))<EOL><DEDENT>mgr = self._get_provider_manager('<STR_LIT>')<EOL>lookup_session = mgr.get_asset_lookup_session(proxy=self._proxy)<EOL>lookup_session.use_federated_repository_view()<EOL>return lookup_session.get_assets_by_ids(asset_ids)<EOL>
Gets the list of assets mapped to the given ``Composition``.

        arg:    composition_id (osid.id.Id): ``Id`` of the
                ``Composition``
        return: (osid.repository.AssetList) - list of assets
        raise:  NotFound - ``composition_id`` not found
        raise:  NullArgument - ``composition_id`` is ``null``
        raise:  OperationFailed - unable to complete request
        raise:  PermissionDenied - authorization failure
        *compliance: mandatory -- This method is must be implemented.*