I need to correct this answer, since I saw that this has not been included in the QVS 9 SR3 manual for some reason. I will re-request that bug and see what's happened.
Meanwhile; the XML node structure for variables in the EDX call in QVS 9 is he following:
There also seems to be a bug that actually only allows the first value to be recorded, so this does not work for multiple variables, yet. I will record that as a bug as well.