Lightweight Ontologies

Giunchiglia, Fausto and Zaihrayeu, Ilya (2007) Lightweight Ontologies. UNSPECIFIED. (Submitted)

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    Ontologies are explicit specifications of conceptualizations. They are often thought of as directed graphs whose nodes represent concepts and whose edges represent relations between concepts. The notion of concept is understood as defined in Knowledge Representation, i.e., as a set of objects or individuals. This set is called the concept extension or the concept interpretation. Concepts are often lexically defined, i.e., they have natural language names which are used to describe the concept extensions (e.g., concept mother denotes the set of all female parents). Therefore, when ontologies are visualized, their nodes are often shown with corresponding natural language concept names. The backbone structure of the ontology graph is a taxonomy in which the relations are “is-a”, whereas the remaining structure of the graph supplies auxiliary information about the modeled domain and may include relations like “part-of”, “located-in”, “is-parent-of”, and many others.

    Item Type: Departmental Technical Report
    Department or Research center: Information Engineering and Computer Science
    Subjects: Q Science > QA Mathematics > QA076 Computer software
    Uncontrolled Keywords: Controlled vocabularies; Taxonomies; Thesauri; Business catalogues; Faceted classifications; Web directories; Topic hierarchies; User classifications
    Report Number: DIT-07-071
    Repository staff approval on: 20 Nov 2007

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