- to add meaning to the data
component ?
- XML (eXtensible Markup Language)
- to decribes the data and to focus what the data is
- RDF ( Resource Description Framework )
- framework for describing resource on the web
- describes resources with properties and properties values which forms the Statement ( subject, predicate and object )
- Statement : "The author of http://www.w3schools.com/RDF is Jan Egil Refsnes".
- resources ( subject ) : http://www.w3schools.com/RDF
- properties ( predicate ) : author
- properties value (object) : Jan Egil Refsnes
- OWL (Web Ontology Language
- represent the meaning of terms in vocabularies and the relationships between those terms
- has three sublanguages :
- OWL Lite
- supports users primarily needing a classification hierachy and simple constraints
- OWL DL
- supports user who wants the maximum expressiveness while retainning computational completeness
- OWL Full
- supports user who want the maximum expressiveness and the syntactic freedom of RDF with no computational guarantees
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