Everything in this "Implementation" section is how the reference implementation of this metadata spec operates. It is not neccesary for any other implementation to do the same things, but I figured it would be nice to document how I decided to make this work as a plumbing set that follows the exchange spec.
I have decided to keep the local data cache in SQLite, which is documented in Local storage.
I have implemented the basics in Rust as a CLI that can get and set values, serialize and materialize. This CLI surface is documented here.
That CLI has a few ways of returning data, which I document in Output and query semantics.