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    $form['filterLdapAuthenticated'] = array(

      '#type' => 'checkbox',

      '#title' => t('Only return ldap authenticated users.'),

      '#description' => t('If checked, only users who are associated with ldap accounts will be returned.'),

    );

   */

  public function sourceForm($source_config) {

    $tokens = array(

    );

    $form_state = array();