public function addCopyTag(Tag $tag, $pos, $len, $prio = null)
	{
		if (!isset($prio))
		{
			$prio = $tag->getSortPriority();
		}
		$copy = $this->addTag($tag->getType(), $tag->getName(), $pos, $len, $prio);
		$copy->setAttributes($tag->getAttributes());

		return $copy;
	}