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  $variables['i18n_string_textgroup_class_[textgroup]'] = array(

    'title' => t('Class to use for the text group'),

    'description' => t('Determines which the class will be use for string translation in the text group.', array(), $options),

    'repeat' => array(

      'type' => 'select',

      'default' => 'i18n_string_textgroup_default',

      'options callback' => 'i18n_string_variable_textgroup_class_list',

    ),

    'submit callback' => 'i18n_string_variable_textgroup_class_submit_callback',

    'group' => 'i18n',

  );

/**

 * Implements hook_variable_type_info().

 */

function i18n_string_variable_type_info() {

  $type['textgroup'] = array(

    'title' => t('Text group'),

    'type' => 'select',

    'options callback' => 'i18n_string_variable_textgroup_list',

  );

  return $type;

}

}

/**

 * Options callback, text groups list.

 */

function i18n_string_variable_textgroup_list() {

  $groups = array();

  foreach (i18n_string_group_info() as $name => $info) {

    $groups[$name] = $info['title'];

  }

  return $groups;

}

/**

 * Options callback, text group classes list.

 */

function i18n_string_variable_textgroup_class_list($variable, $options = array()) {

  return array(

    'i18n_string_textgroup_default' => t('Text group handler default.', array(), $options),

    'i18n_string_textgroup_cached' => t('Text group handler which include persistent caching.', array(), $options),

  );

}

/**

 * Submit callback. Execute Reset the persistent caches after save the text group class variables.

 */

function i18n_string_variable_textgroup_class_submit_callback($variable, $options, $form, $form_state) {

  // Reset the persistent caches.

  cache_clear_all('i18n:string:' , 'cache', TRUE);

}