> I became curious if this development situation will be improved further.

Who would you expect to improve that? Are you thinking of the
developers of the official W3 recommendations or the developers of
BaseX?


How will the available software evolve further also according to information
like “BaseX offers a complete implementation of the XQuery Update Facility (XQUF).”?

Version 1 is fully supported. We might add additional features of Version 3, depending on requirements of our users and clients.