Method arguments in exported XMI and XMI version

Hello,
I am digesting the VP exported XMI files with sequence diagrams; but if there is a method with arguments in the VP diagram, I cannot find them in the exported XMI. Are the arguments conserved in the exported file?

Also it would be nice that the XMI format would be updated to the “http://www.omg.org/spec/XMI/20110701” version.

Regards,
Luis M