[unified2orchestra] suppress unneeded XML namespace

[donmendelson]

Reported by Jörg Thonnes in the FIX Forum:

wondering whether this XSD is still required:

xmlns:functx="http://www.functx.com" My IDE says: no. So could it be dropped at all?

Cheers, Jörg

Suppress that namespace, which is unneeded in the output.