ELK
ELK is a free and open source reasoner for the lightweight ontology language OWL 2 EL.
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Versions & Compatibility
This section lists available versions of ELK.
If you click on the button below to add a new version of ELK, you will be asked to define a page title for the new version. Please adhere to the naming convention of ELK X.X.X when you define the new page!
The ELK reasoner is based on Java and can be controlled using the OWL API, Protégé, the Snow Owl ontology editor, or a basic command line interface. ELK is available under the Apache License 2.0.
ELK is very fast. It can classify the SNOMED CT ontology with around 300,000 classes in less than 4 seconds on a modern laptop (details can be found in a technical report). This is achieved by highly optimized consequence-based reasoning algorithms that can also take advantage of multi-core CPUs.
ELK 0.1.0 is the very first release of ELK. It still has only limited support for OWL constructs and does not yet implement all reasoning tasks that the OWL API includes. Its main features are:
- Reasoning tasks: classification and consistency checking
- Supported OWL constructs: ELH fragment + transitivity (ObjectIntersectionOf, ObjectSomeValuesFrom, SubClassOf, EquivalentClasses, SubObjectPropertyOf, TransitiveObjectProperty)
- Optional OWL API bindings
- Protégé plugin (can also be used in Snow Owl)
- Command line interface
- Parser for input files in OWL 2 Functional Style Syntax
ELK can be run in all operating systems that support Java 1.5 or above. For further details, please see the online documentation. The ELK reasoner discussion group is available for further discussions.
