OWL support

I'm doing a little work with PowerLoom-OWL conversion, and may have a
series of questions in a few days :)

Some parts of them are easy, but when I was going to export the data
in PL into an OWL KB, I can't find a way to do things like "acquire
all the concepts from the PL KB". At present I'm using
Module.allSymbols, however it's still hard to tell what the returned
Stella_Object is (concept, relation, etc).

I'm wondering if there's a more elegant method to achieve that. Thanks a lot.
--
Pan Xingzhi