I've been thinking of a tool to generate a kind of schema for a website, similar to RDF[0] or JSON-LD[1]. The end goal of this would be interoperability between tools - ideally I could browse HN and other related sites or forums in my RSS reader with a unified interface, or translate the Roam note format into the Athens equivalent to use with either.
[0] https://en.wikipedia.org/wiki/Resource_Description_Framework