OASIS keeps an a interoperability corpus of ODF test documents
https://www.oasis-open.org/committees/oic/charter.php
Do you use of know of any large XML/-ish reference korpora which could be used for testing purposes? In case, you don't could you suggest where or how could one find such a thing?
lbrtchx basex-talk@mailman.uni-konstanz.de:Any (hopefully representative) reference korpora of XML-ish documents?