@toiletpaper @p @NonPlayableClown Sure it's not great, and I'd rather have a much better designed domain-specific language for transforming data.

I don't particularly care about which format but more about how things architecturally work. One shouldn't have to murk around in http headers to request a ressource, that's what URLs are for, dammit.
(Although JSON-LD crowd seems to loves to do all the mistakes that XML did and some more instead of learning from it)