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I had pretty much the same reacon while reading the article. "BlogPosting" isn't particularily informative. The rest of the metadata looked like it could/should be put in <meta> tags, done.

A very bad example if the intention was to demonstrate how cool and useful semweb is :-)

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The schema.org data is much more rich than meta tags, though. Using the latter, an author is just a string of text containing who-knows-what. The former lets you specify a name, email address, and url. And that's just for the Person type—you can specify an Organization too.

That's still just tangential Metadata. The point of a semantic web would be to annotate the semantic content of text. The vision was always that you can run a query like, say, "physics:particles: proton-mass", over the entire web, and it would retrieve parts of web pages that talk about the proton mass.

Which was already possible with RDF. It is hard to not see JSON-LD as anything other than "RDF but in JSON because we don't like XML".

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