[PHP] Extending Element class in a dom tree?

[=?ISO-8859-1?Q?Erik_Franz=E9n?=]

The DOM implementation i PHP5 allows classes to be extended. Extending 
the Document class is no problem, but how can I extend the Element class 
and use it in a DOM tree?

DOMDocument::createElement returns a DOMElement object which you cannot 
extend.

Could this be a solution?
class MyElement extends DomElement {
    function __construct($a_stTagName) {
        //has to be called!
        parent::__construct($a_stTagName);
    }
    function myFunction() {
        // do something
    }
}
$oDom = new DomDocument();
$oMyElement = new MyElement('mytag');
$oMyElement = $oDom->importNode($oMyElement, true);
$oMyElement = $oDom->appendChild($oMyElement);
Regards
/Erik
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