Document RDFa initial context & JSON-LD context design

[aamedina]

I need to write documentation explaining that the net.wikipunk.boot namespace contains the RDFa initial context for "wikipunk" RDF processors.

net.wikipunk.ext contains an extended context that may be included if desired.

The design concept is to treat Clojure data structures, which either describe data themselves or contain metadata in source, as potential sources of RDF triples. Using RDFa vocabulary I can annotate Clojure data and retrieve embedded triples. In order to do this I needed to settle on some vocabulary that I could rely on the processor being "aware" of so the RDFa context fits the bill.

Usually these prefix mappings exist as blank nodes in a graph, but how do you figure out what they are before you have a graph? In order to sort through the potential mappings I treat Clojure namespaces with an :rdf/type of :jsonld/Context as places where these prefix or term mappings reside. Any required namespaces with this type will be searched for mappings when the system is started.