@abc.abstractmethod<EOL><INDENT>def get_asset_content_form_for_update(self, asset_content_id):<DEDENT>
return<EOL>
Gets the asset content form for updating an existing asset content.

        A new asset content form should be requested for each update
        transaction.

        :param asset_content_id: the ``Id`` of the ``AssetContent``
        :type asset_content_id: ``osid.id.Id``
        :return: the asset content form
        :rtype: ``osid.repository.AssetContentForm``
        :raise: ``NotFound`` -- ``asset_content_id`` is not found
        :raise: ``NullArgument`` -- ``asset_content_id`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request

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