Hi Kristian,
A new post has been created about the XML Extension in the Tips And Tricks section: How to use the GDL XML Add-On?. It contains a basic example about listing the parameter descriptions and values of an xml file. If you would like to see a more complex example then please send your request to gdlcenter@graphisoft.com. We will check it before long and may release a new post about it.
Csilla Mai
Library Developer, Library Team
GRAPHISOFT SE