Ontology Learning

Different approaches have been used for building ontologies, most of them to date mainly using manual methods (Text Mining for the Semantic Web). An approach to building ontologies was set up in the CYC project, where the main step involved manual extraction of common sense knowledge from different sources. Ontology construction methodologies usually involve several phases including identifying the purpose of the ontology (why to build it, how will it be used, the range of the users), building the ontology, evaluation and documentation. Ontology learning relates to the phase of building the ontology using semiautomatic methods based on text mining or machine learning.