>oNewNode = oXA.IXMLDOMElement.parentNode.createElement("NewNode")
>
>*or
>
>oXmlDoc = CreateObject("Msxml2.DOMDocument.4.0")
>oNewNode = xmlDoc.createElement("NewNode")
>

thanks Sergey!

Unfortunately, AFAICS there is nothing like a "createElement" method anywhere in the IXMLDOMElement.
But using the MSXML parser works, and I'm thinking of using it directly instead of the interface that is provided by the XMLAdapter. Seems that this interface to the xmlparser is not complete.