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  • × author_ss:"Fischer, D.H."
  • × theme_ss:"Wissensrepräsentation"
  • × type_ss:"a"
  1. Fischer, D.H.: ¬Ein Lehrbeispiel für eine Ontologie : OpenCyc (2004) 0.00 
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    Source
    Information - Wissenschaft und Praxis. 55(2004) H.3, S.139-142
    Type
    a
  2. Fischer, D.H.: From thesauri towards ontologies? (1998) 0.00 
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    Abstract
    The ISO 2788 guidelines for monolingual thesauri contain a differentiation of "the hierarchical relationship" into "generic", "partitive", and "instance", which, for purposes of document retrieval, was deemed adequate. However, ontologies, designed as language inventories for a wider scope of knowledge representation, are based on all these and some more logical differentiations. Rereading the ISO 2788 standard and inspecting the published Cyc Upper Ontology, it is argued that the adoption of the document-retrieval definition of subsumption generally prevents the conception or use of a thesaurus as a substructure of an ontology of the new kind as constructed for AI applications. When a thesaurus is used for fact description and inference on fact descriptions, the instance-of relationship too should be reconsidered: It may also link concepts and metaconcepts, and then its distinction from subsumption is needed. The treatment of the instance-of relationship in thesauri, the Cyc Upper Ontology, and WordNet is described from this perspective
    Type
    a

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