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I don't see any indication that Abstract Wikipedia articles are anything more than a sequence of "constructors" and those "constructors" are essentially just triples (with qualifiers) that a "renderer" turns into a specific human language.

The example they give is the constructor:

rank(SanFrancisco, city, 4, population, California)

And the English renderer will output:

"San Francisco is the fourth largest city by population in California."

Agreed, but my point was that the aim has always been to encode these facts and then mix them into wikipedia for any assertion / attribute, so that any fact is backed by an assertion.

Exactly. The main difference is that they would now not be used to generate the infoboxes, but actual prose.

The data is stored as a bunch of triples but it encodes a graph. You can use tools like sparql to query that graph.

https://www.stardog.com/tutorials/sparql/