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Knowledge graphs sound like the way you represent knowledge in Prolog and Datalog...and so nothing particularly new. Am I wrong?

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Knowledge graphs have been around for a long time (early 70s). You could even argue they're older than that when considering something like an ontological map. I think this post is not meant to demonstrate novel technology or structure; rather, it's simply a self-reported introduction to the topic space.

Can you share some insights into how Datalog does it?

I'm not an expert; but both Datalog and Prolog make use of Horn clauses, e.g.,

``` person(mary) person(joe) parent(joe,mary) child(c,p) :- parent(p,c) ```

(Don't quote me on the syntax.) But you can specify what the OP calls "triples" directly in Datalog, express logical relationships among them, and then query them.

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