I got past the issues I was facing when porting my SIXX + XMLPullParser combo to GemStone, and now both packages are available on GemSource.
XMLPullParser-kdt.8 loads cleanly into GemStone as well as Squeak/Pharo, so there’s nothing complicated there.
The SIXX package is a hybrid of my work (the SIXX package on SqueakSource) and Dale’s GemStone port (as of about [...]