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."