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In order to automatically understand the inferred relationships between SNOMED CT expressions and/or precoordinated concepts, the expressions should be classified using a semantic reasoner. A number of reasoners exist, such as Snorocket, ELK and FACT++, which can classify and reason over OWL 2 EL.

Before a SNOMED CT compositional grammar expression can be classified using one of these reasoners, it must first be parsed (as described in section 7.2), normalised and then translated into OWL 2 EL. The specific normalisation transformations that are required prior to translation into OWL include:

The translation into OWL can then be performed in a variety of programming languages, including Perl.

Please note that an alternative way to classify a set of expressions is to test each pair of expressions for equivalence and subsumption by performing a string-based comparison on their normal forms. For more information on this approach please refer to section 12.5 of the Terminology Services Guide.