public function rename($tagId, $caption)
{
$tag = new Tag($this->getDataSource());
$tag->loadById((int) $tagId);
$tag->setValue('caption', $caption);
$tag->setValue('slug', slugify($caption));
$tag->setInheritableAttributesValues(array('attributes' => array('title' => $caption)), true);
$tag->update();
return $tag;
}