Hi Christian, sounds interesting.
I did not come accross that topic so far, just reading throught it.
One question regarding performance...I am just facing some issue with mii15 sp2. Seems like the JOIN QUERY is still buggy...as well as the JOIN MDO...so I have to go for the XML GENERIC SORTFILTER / XML JOINER.
Is there a chance to get better performance using xlst to sort/filter XML files? or can i even use it for joining data?
Thanks for a brief feedback!