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diff --git a/lib/public/WorkflowEngine/IComplexOperator.php b/lib/public/WorkflowEngine/IComplexOperator.php
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+<?php
+declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2019 Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @author Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OCP\WorkflowEngine;
+
+/**
+ * Interface IComplexOperator
+ *
+ * This interface represents an operator that is less generic and indicates
+ * that some of the tasks it does itself instead of relying on the engine.
+ * This includes:
+ *
+ * * registering listeners – the implementing app needs to ensure that the
+ *   business logic registers listeners to the events it listens to. For example
+ *   when direct storage access is required, adding a wrapper or listening to
+ *   a specific one is required over usual file events.
+ *
+ * @package OCP\WorkflowEngine
+ *
+ * @sincee 18.0.0
+ */
+interface IComplexOperator extends IOperator { }