@abc.abstractmethod<EOL><INDENT>def search_among_assets(self, asset_ids):<DEDENT>
pass<EOL>
Execute this search among the given list of assets.

        :param asset_ids: list of asset ``Ids``
        :type asset_ids: ``osid.id.IdList``
        :raise: ``NullArgument`` -- ``asset_ids`` is ``null``

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