def get_asset_content_form_for_update(self, asset_content_id=None):
if asset_content_id is None:<EOL><INDENT>raise NullArgument()<EOL><DEDENT>asset = None<EOL>for a in AssetLookupSession(self._repository_id,<EOL>proxy=self._proxy,<EOL>runtime=self._runtime).get_assets():<EOL><INDENT>for ac in a.get_asset_contents():<EOL><INDENT>if ac.get_id() == asset_content_id:<EOL><INDENT>asset = a<EOL>asset_content = ac<EOL><DEDENT><DEDENT><DEDENT>if asset is None:<EOL><INDENT>raise NotFound()<EOL><DEDENT>asset_content_form = objects.AssetContentForm(asset_content._my_map, asset_id=asset.get_id())<EOL>self._forms[asset_content_form.get_id().get_identifier()] = not UPDATED<EOL>return asset_content_form<EOL>
Gets the asset form for updating content for an existing asset.

        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.*