Qizx is a proprietary XML database that supports XQuery and XPath.
Qizx started in 2004 at Axyana Software. The company was then acquired by Qualcomm in 2013, but then the DBMS was discontinued in 2016.
Document / XML
XQuery
https://www.qualcomm.com/qizx
Axyana Software
FR
2004
Qualcomm
Commercial
Java, Python
OS X
Proprietary
https://en.wikipedia.org/wiki/Qizx