--- /dev/null
+<?php
+
+namespace Drupal\system;
+
+use Drupal\Core\Config\Entity\ConfigEntityInterface;
+
+/**
+ * Provides an interface defining a menu entity.
+ */
+interface MenuInterface extends ConfigEntityInterface {
+
+ /**
+ * Returns the description of the menu.
+ *
+ * @return string
+ * Description of the menu.
+ */
+ public function getDescription();
+
+ /**
+ * Determines if this menu is locked.
+ *
+ * @return bool
+ * TRUE if the menu is locked, FALSE otherwise.
+ */
+ public function isLocked();
+
+}