I'll take a look at that, and probably write a new test for it. It think that will work as it is, because the original xpath expressions should just work there. 

The only problem you might face there, is if you would like to compare 2 multivalue properties. That wouldn't given any result then. But not sure if we can fix that. Because you can't use an xpath expression within a xpath expression, at least I got an error while trying)