Defines a Plugin annotation object that just contains an ID.
Expanded class hierarchy of PluginID
class PluginID implements AnnotationInterface {
  /**
   * The plugin ID.
   *
   * When an annotation is given no key, 'value' is assumed by Doctrine.
   *
   * @var string
   */
  public $value;
  /**
   * Implements \Drupal\Core\Annotation\AnnotationInterface::get().
   */
  public function get() {
    return array(
      'id' => $this->value,
    );
  }
}| 
            Name | 
                  Modifiers | Type | Description | Overrides | 
|---|---|---|---|---|
| 
            PluginID:: | 
                  public | property | The plugin ID. | |
| 
            PluginID:: | 
                  public | function | 
            Implements \Drupal\Core\Annotation\AnnotationInterface::get(). Overrides AnnotationInterface:: |