xmlto with postvalid

Greetings,

since Marcel Telka just ported xmlto to Cygwin, I just gave it a couple 
of runs. Everything works as expected, but I wonder whether I can tell 
xmlto to postvalidate my source after evaluating my xincludes, just like 
the -postvalid switch of xsltproc. Otherwise I have to switch off 
validating to be able to process my source with xmlto. If this 
functionality is not available yet, Tim, can you add another command 
line switch to make this available in one of your next releases?

$ xmlto --version
xmlto version 0.0.12


Thanks,
Patrick