[findUsages] get Category Follow

Hi,

i'm looking for examples of findUsages with more than 1 category. I've tried adding an `if` inside `get Category` (something like `if (node.ancestor<concept = X>.isNotNull) {return "X"} else {return "Y"}` but this doesn't seem to group the results in 2 categories X & Y. Can someone please give an example of how categories work?

Thanks,

lacramioara