The conceptual search & navigation paradigms (Structure, Patterns, and Ontology) are based on the use of entities from the knowledge base. The knowledge base is a kind of database that stores the knowledge for a particular domain. It consists of a set of data (entities, entity properties, descriptions, aliases) with respect to a conceptual model, called ontology, and rules for reasoning over this data. Ontology is a formal representation of the concepts within a given domain and the relationships between these concepts.
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