Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/rest/src/LinkManager/LinkManagerInterface.php

@@ -0,0 +1,23 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\rest\LinkManager\LinkManagerInterface.
+ */
+
+namespace Drupal\rest\LinkManager;
+
+/**
+ * Interface implemented by link managers.
+ *
+ * There are no explicit methods on the manager interface. Instead link managers
+ * broker the interactions of the different components, and therefore must
+ * implement each component interface, which is enforced by this interface
+ * extending all of the component ones.
+ *
+ * While a link manager may directly implement these interface methods with
+ * custom logic, it is expected to be more common for plugin managers to proxy
+ * the method invocations to the respective components.
+ */
+interface LinkManagerInterface extends TypeLinkManagerInterface, RelationLinkManagerInterface {
+}