Yeah, I'd like to know the story behind it. topotext is weird and unlike anything I've found in the literature. It is kind of like RGA, but with more links. And I haven't seen anyone else layer attributes on top of text.

It looked like the other stuff came later and was somewhat orthogonal. (Although their ordered set construct was abusing topotext to represent ordered lists of ids.)

I don't know how much has changed since 2018. I think my table decoding may be broken now.