Canola Team: I know that documentation is not yet posted. However, could you provide a list of terra_types and the relationships between them -- and the various displays throughout Canola?

I'm writing a plugin, but I'm getting confused on the terra_type specs that Canola expects as it moves between displays.

I have been through all the provided plug-ins, but they don't tell me what Canola is looking for. They tell me what the last.fm plugin provided, for example, but no WHY it provided it.

Thanks.