What kind of OWL profiles are supported in VOS DL, EL, QL ,RL? Is is possible to use or integrate standard reasoners? (Hermit, Pellets, etc.)
What flavors of reasoning are supported in VOS?
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Reasoning support in Virtuoso Open Source (VOS) is detailed in the inferencing and reasoning documentation. Integration with other standard reasoners is not supported, although it probably could be implemented if there were sufficient demand for it.
Virtuoso 8+ commercial edition supports Magic Sets and Custom Inference Rules allowing custom inference rules to be created for most use case.
(Also asked and answered on the OpenLink Community Forum)
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Virtuoso has its own built-in Inference & Reasoning capabilities. That said, if absolutely necessary, you can integrate 3rd party reasoners via a custom development efforts using the Server Extension API which allows integrated using a variety of runtime environments supported by Virtuoso (e.g., Java, Python, PHP, .NET, Ruby, Mono, etc.) or directly using 'C'.
Virtuoso Functionality
Virtuoso Open Source Edition supports built-in Reasoning and Inference. By that I mean it automatically applies said functionality for the following relationship types:
owl:sameAs
owl:equivalentProperty
owl:equivalentClass
owl:inverseOf
owl:InverseFunctionalProperty
rdfs:subPropertyOf
rdfs:subClassOf
All of the above are enabled via pragma and rules mapped to a named graph.
The commercial editions of Virtuoso go further by supporting Custom Inference Rules, courtesy of SPARQL as the Rules Language -- facilitated by terms from the SPIN Ontology.
You would use Custom Inference rules to implement rules based on other reasoning profiles described by terms from OWL. Basically, you are only limited by imagination since SPARQL offers functionality delivered by Rules Languages of yore, e.g., Datalog, etc.
All of this functionality is native to Virtuoso and scales massively.
Related
Various Virtuoso Reasoning & Inference Examples Collection -- these live examples are usable against Live instances of Virtuoso, e.g., DBpedia and Wikidata editions deployed using Virtuoso
Basic Built-In Reasoning & Inference Guide
Basic Custom Reasoning & Inference Guide
Built-In Reasoning & Inference Guide -- using British Royal Family Relationship Types
Custom Reasoning & Inference Guide -- using British Royal Family Relationship Types