not sure whether that's out of scope: https://github.com/dret/webconcepts has the idea of "concepts" and "values", which at some level are close to IANA registries and the values in them. it focuses on web-API level things. but there is some data to play around with: http://webconcepts.info/specs/IETF/RFC/ lists 177 RFCs and there is structured data about them. http://webconcepts.info/JSON explains the JSON data available, but i could easily create other data (in XML or JSON) if that would work better.
if there is an opportunity to support this more structured view of RFCs, that would be nice, and i'd be willing to put some effort into making data available from http://webconcepts.info/.