source/Application/Controller/Admin/NavigationTree.php
protected function _merge($domNew, $dom)
    {
        $xPath = new DOMXPath($dom);
        $this->_mergeNodes($dom->documentElement, $domNew->documentElement, $xPath, $dom, '/OX');
    }
protected function _merge($domNew, $dom)
    {
        $xPath = new DOMXPath($dom);
        $this->_mergeNodes($dom->documentElement, $domNew->documentElement, $xPath, $dom, '/OX');
    }
protected function _merge ( $ domNew , $ dom ) { $ xPath = new DOMXPath ( $ dom ) ; $ this -> _mergeNodes ( $ dom -> documentElement , $ domNew -> documentElement , $ xPath , $ dom , '/OX' ) ; }
If oDomXML exist meges nodes

@param DomDocument $domNew what to merge
@param DomDocument $dom    where to merge
If oDomXML exist meges nodes