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About 10 or 12 years ago I spent a lot of time experimenting with the semantic web library for SWI-Prolog and it was time well spent. In modern times, commercial/community versions of tools like Star Dog are probably a better place to start experimenting with what OWL reasoning (or RDFS or RDFS+) can do. On great use is being able to mix and match different RDF data sets without translating to a common Ontology.

I have written a few semantic web books and I guess I am still a fanboy, but I also agree with you that "classic" semantic web apps using the W3 standards have had only partial acceptance into mainstream use while similar graph based systems like Knowledge Graph affect how many people use the web (at least for search, Google Now, etc.).

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