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Formal contexts in ontologies

In this paper, an ontology is regarded as an information system in formal concept analysis. Then, based on theories of concepts, a formal context in ontologies defined by a set of properties is conceptualized as a concept with the extent and the intent. There are two kinds of properties implied by a formal context: one is the set of properties in its intent and another is the set of default properties. Then the features of formal contexts in ontologies are discussed in detail.