Ok, I have no problem with being out of any existing specification with the delimiter. 
I do not expect my solution will ever be of an official status. But with this solutin you **can** use the files with the extenstion .xmpd as normal mpd files (viewing) and additionally they are a container for multiple mpd files itself.
I do not expect my solution will ever be of an official status. But with this solutin you **can** use the files with the extenstion .xmpd as normal mpd files (viewing) and additionally they are a container for multiple mpd files itself.