Use of XML Functions in view-definitions

[Vereina]

Hello, my first post on this forum ....

I have created some custom trees to use withTwonky v6.0.34 on my QNAP NAS.

My question is:

Is there any way to use XML functions such as substring-before as part of a container statement?

What I would like to be able to do is something like:

buildon='fn:substring-before(upnp:genre,'-')'

... but I have no idea whether doing something like this is possible or, even if it is, what the the correct syntax would be.

Any advice would be appreciated!

[phibertron]

not that I am aware of