Is it possible to get selection sets from XRef scenes?

I'm building some scripts to edit things in the current scene at render time. (including things in XRef scenes).

So far I've got some stuff working that will change properties based on a layer selection but a couple of colleagues have asked for an include/exclude list. For the most part when people use include/exclude lists it's because they already have a selection set for the objects that they need.

Is it possible to get a selection set name/list of objects from an XRef scene?