So, the thing about basing a communication protocol on json-ld (or any rdf format, it doesn't matter) is that it's an incredibly bad idea. To illustrate, consider the long term nuclear storage warning messages. And consider an rdf processor for those messages which understand the concept of places and events, but nothing else.
This is a place.
Something happened here.
It's still happening.
It's in the center of the place.
