I've adapted Surnia, my toy OWL reasoner, to do the various forms of RDF reasoning required by the RDF Core tests. This reasoner is a wrapper for Otter, a well-known and stable open source FOL theorem prover. All RDF triples get turned into FOL sentences of the form rdf(a,b,c); the additional semantics are provided by various files of first-order axioms. Because of the simplicity of the axioms for RDF/RDFS (mostly the lack of function terms), Otter terminates even when using complete reasoning, so it confirms non-entailments. The test results feed is: http://www.w3.org/2003/08/surnia/test-results/current/results.rdf and you can see them on the test results page: http://www.w3.org/2003/11/results/rdf-core-tests (Surnia brings a few bright red Fails to the chart in its handling of datatypes. That's its weakest area, but it's still not bad for an evening's work.) -- sandroReceived on Friday, 7 November 2003 02:19:39 GMT
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