Ontology of core data mining entities (OntoDM-core)

http://www.ontodm.com/doku.php?id=ontodm-core

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Ontology of datatypes (OntoDT)

http://www.ontodt.com

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Ontology for representing the knowledge discovery process (OntoDM-KDD)

http://www.ontodm.com/doku.php?id=ontodm-kdd