Michael,
You should have the resource, The Lexham Glossary of Semantic Roles.This gives an overview of Case Frames. It also describes the Semantic Roles used in both Case Frames and Clause Participants.
It isn't too hard to grasp with this introduction and the definitions. Run a few simple examples ('created' in Genesis 1:1, for example, or 'believe' from John 1:7) to help get your head around this new terminology and thinking.
BTW: for me and many others case frames is a bit esoteric, so don't be disappointed if you end up feeling that way, too.
To expand on what Mark said, while case frames are such a different way of looking at things and while Logos doesn't always get their current display right, trust me that in a few years you'll believe they are far more useful than grammatical subject, indirect object, prepositional object ...
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