Sample XML files for testing, etc.
http://www.cafeconleche.org/examples/religion/ot/ot.xml (see many other examples at: http://www.cafeconleche.org/examples/ )
"TEI XML file - Letter from John Cawte Beaglehole, 1927-12-13"
Use agreement link to download "An English Translation of the Datang xiyu ji" in TEI
Sources:
A bunch here: https://github.com/zepheira/amara/tree/master/demo/data
Lots of XSLT here: http://www2.informatik.hu-berlin.de/~obecker/XSLT/
Or help yourself like so: "Tip: Use Web search engines to locate XML"