function xxx_theme() {
  $path = drupal_get_path('module', 'xxx') . '/templates';
  return array(
    'pricing_template' => array(
      'template' => 'xxx_template',
      'path' => $path,
       'render element' => 'page',
    ),
  );
}



/**
 * Implements hook_uninstall().
 */
function xxx_callback() {
  return theme('xxx_template');
}