Ontology
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Ontology
l Definition
n explicit formal specification of a conceptualization, intended for sharing among different applications and expressed in a language
u formal: machine readable
u conceptualization: semantic
u sharing: goal
l Language
n OWL: developed from DAML+OIL
n Logic base: DL
n Language base:RDF
l Construct
n Tool
n Methodology
n Maintenance
l Application
n Semantic web :semantic annotation ,used for searching
n Information integration: ontology mapping, transform information to ontology, theoretical and empirical basis
n knowledge management : knowledge representation, query
n Semantic web service : semantic web + web service
l Mapping
n algorithm :syntactic, semantic ,machine learning , top-level ontology
n tools: semi-automatically
n Schema mapping: similar
l Summary
n Language and mapping techniques are base
n Integration and merging are methods
n Search and data access are goals
n Direction:
u find good methods and build good tools in the ontology domain
u use these tools to facilitate other research
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