Open Annotation RDFa (again)

I found and read through an earlier thread I found in the list archives on
a possible RDFa representation of the OA Core Data Model. I'd already
crafted one of my own, and found that the RDF/graph output was
similar--hopefully it's accurate too! :)

I wrote up the exploration in a blog post:
https://hypothes.is/blog/open-annotation-rdfa-using-hypothes-is-json/

I'm using our (Hypothes.is) JSON document as a foundation, then piping it
through Mustache.js, and out into HTML+RDFa.

The hope is to explore a basic RDFa representation of OA, so we can begin
encouraging CMS plugins (etc) to publish whatever comments and annotations
they have in some form of RDF. "Peppering" some new markup into existing
comment templates seemed like low hanging fruit. :)

Once it's there, hopefully others out here making OA-focused tooling can
harvest that data and do useful things with it--in or out of the browser.

Feedback is very welcome, as I hope to make this better, and share the
output with a wider audience once the dust settles on this idea. :)

Thanks!
Benjamin