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

core/modules/migrate/src/Annotation/MigrateSource.php

@@ -0,0 +1,48 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\migrate\Annotation\MigrateSource.
+ */
+
+namespace Drupal\migrate\Annotation;
+
+use Drupal\Component\Annotation\Plugin;
+
+/**
+ * Defines a migration source plugin annotation object.
+ *
+ * Plugin Namespace: Plugin\migrate\source
+ *
+ * For a working example, check
+ * \Drupal\migrate\Plugin\migrate\source\EmptySource
+ * \Drupal\migrate_drupal\Plugin\migrate\source\UrlAlias
+ *
+ * @see \Drupal\migrate\Plugin\MigratePluginManager
+ * @see \Drupal\migrate\Plugin\MigrateSourceInterface
+ * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
+ * @see \Drupal\migrate\Annotation\MigrateProcessPlugin
+ * @see \Drupal\migrate\Annotation\MigrateDestination
+ * @see plugin_api
+ *
+ * @ingroup migration
+ *
+ * @Annotation
+ */
+class MigrateSource extends Plugin {
+
+  /**
+   * A unique identifier for the process plugin.
+   *
+   * @var string
+   */
+  public $id;
+
+  /**
+   * Whether requirements are met.
+   *
+   * @var bool
+   */
+  public $requirements_met = TRUE;
+
+}