*** I GOT IT !!!!! *** :D :D :D :D
*** I GOT IT !!!!! *** :D :D :D :D
*** I GOT IT !!!!! *** :D :D :D :D

what was missing: xmldata = new XML(parsed_web_content)

so:
after fetching the XML data from a webserver (or any other source) you have to "convert" it into "true" XML with "xmlPage = new XML(data)"
Then you can access the XML as usual.

"Thank you" Philips, for this "well" documented Development guide !!! :-(
Would it really have been this hard to leave a word about this command in the manual ???????

...since parsing XML makes only sense if you load it from a webserver or who would integrate XML in it's source code???


OH MAN! anyway ... I'm so happy now, that it works!
And I hope that I could help others too! (since e.g. the writer of the weather module also had to use a workaround with hundreds of IndexOf, substr,... to get the XML data)

So after 4 days spending my time finding out how to parse XML data, I can finally start my ProntoEPG project.
... which will also be "open source" like my ProntoTV

final words: HAPPY CODING, FRIENDS ! :-)