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vendor/gedmo/doctrine-extensions/lib/Gedmo/Tree/Node.php

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+<?php
+
+namespace Gedmo\Tree;
+
+/**
+ * This interface is not necessary but can be implemented for
+ * Entities which in some cases needs to be identified as
+ * Tree Node
+ *
+ * @author Gediminas Morkevicius <gediminas.morkevicius@gmail.com>
+ * @license MIT License (http://www.opensource.org/licenses/mit-license.php)
+ */
+interface Node
+{
+    // use now annotations instead of predefined methods, this interface is not necessary
+
+    /**
+     * @gedmo:TreeLeft
+     * to mark the field as "tree left" use property annotation @gedmo:TreeLeft
+     * it will use this field to store tree left value
+     */
+
+    /**
+     * @gedmo:TreeRight
+     * to mark the field as "tree right" use property annotation @gedmo:TreeRight
+     * it will use this field to store tree right value
+     */
+
+    /**
+     * @gedmo:TreeParent
+     * in every tree there should be link to parent. To identify a relation
+     * as parent relation to child use @Tree:Ancestor annotation on the related property
+     */
+
+    /**
+     * @gedmo:TreeLevel
+     * level of node.
+     */
+}