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

        :param comment_ids: list of comments
        :type comment_ids: ``osid.id.IdList``
        :raise: ``NullArgument`` -- ``comment_ids`` is ``null``

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