function address_field_widget_form(&$form, &$form_state, $field, $instance, $langcode, $items, $delta, $element){
  switch ($instance['widget']['type']) {
    case 'address_widget':
      $elements['street'] = array(
        '#title' => 'Улица',
        '#description' => 'Например, <em>ул. Ленина</em> или <em>Ленинский просп.</em>',
        '#type' => 'textfield',
        '#required' => $element['#required'],
        '#autocomplete_path' => 'streets/autocomplete', //машинное имя словаря
        '#maxlength'=> 40,
        '#size' => 40,
        '#default_value' => isset($items[$delta]['street']) ? $items[$delta]['street'] : '',
      );
      break;
  }
  return $elements;
}