Per the this discussion:
For example, if you've created offset annotations for "person" and "location", right now you can write
#uw8( term1.person lives term2.location)
to approximate that a person resides in a location.
But if you had an annotation that says term1.person stands in a "resides" relation with term2.location, this extension should allow you to write:
#relation[resides]( term1.person term2.location )
This would be a new type of representation node in the Bayes Net.