Shout-out to @drobilla and his Serd RDF library & serdi, which is by far the fastest RDF converter (and probably C-library) out there 🚀 If you never used it, give it a try. Great for converting large datasets drobilla.net/software/serd.h…
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Serd test suite is also an amazing help to write RDF parsers. It would be great to move them upstream in github.com/w3c/rdf-tests

GitHub - w3c/rdf-tests: Repository for the RDF Tests Community Group

Repository for the RDF Tests Community Group. Contribute to w3c/rdf-tests development by creating an account on GitHub.

github.com
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I tried to upstream some changes to the test suite ages ago, but wasn't successful. Many of the additional tests are pretty implementation specific (serd uses a 100% test coverage policy), but some do cover genuine holes in the official suite and would be good additions.
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It's very sad to hear. @Oxigraph parsers passes all the tests but six so I would hope for a good chunk of them to be quite generals. @pchampin Do you think the project of a new W3C RDF working group would be a good help to do some improvements to the official Turtle test suite?
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Replying to @pchampin @Tpt93 @linkedktk @oxigraph
I don't remember the details very well, I'd have to dig it up. One of the issues was that the outputs were in the wrong order, so no streaming parser could pass them. TBH I'm generally pretty jaded with the W3C (especially since RDF 1.1) these days, so it's pretty swapped out.