/**
* Add an XML string to the current node.
*
* @param string $tree
* @return XMLNode
* The newly created node object
*/
function add_node_tree($tree)
{
$xdoc = new \DOMDocument('1.0', $this->owner->encoding());
$xdoc->preserveWhiteSpace = false;
$xdoc->loadXML($tree);
$t = $this->doc->importNode($xdoc->firstChild, true);
$n = clone $this;
$n->node = $this->node ? $this->node->appendChild($t) : $this->doc->appendChild($t);
unset($xdoc, $tree, $t);
return $n;
}
