diff --git a/core/lib/Drupal/Core/Annotation/Plugin.php b/core/lib/Drupal/Core/Annotation/Plugin.php
index cb1ed60..577a084 100644
--- a/core/lib/Drupal/Core/Annotation/Plugin.php
+++ b/core/lib/Drupal/Core/Annotation/Plugin.php
@@ -36,14 +36,33 @@ class Plugin implements AnnotationInterface {
    * classed annotations that were used.
    */
   public function __construct($values) {
+    $this->definition = $this->parse($values);
+  }
+
+  /**
+   * Parses an annotation into its definition.
+   *
+   * @param array $values
+   *   The annotation array.
+   *
+   * @return array
+   *  The parsed annotation as a definition.
+   */
+  protected function parse(array $values) {
+    $definitions=array();
+
     foreach ($values as $key => $value) {
       if ($value instanceof AnnotationInterface) {
-        $this->definition[$key] = $value->get();
+        $definitions[$key] = $value->get();
+      }
+      elseif (is_array($value)) {
+        $definitions[$key] = $this->parse($value);
       }
       else {
-        $this->definition[$key] = $value;
+        $definitions[$key] = $value;
       }
     }
+    return $definitions;
   }
 
   /**