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Ontologies in RDF-S/OWL

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Emanuele Della Valle
Emanuele Della Valle
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[object Object],[object Object],[object Object],Ontologies in RDF-S/OWL
Share, Remix, Reuse — Legally ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Ontology: RDF-S and OWL
RDF-S/OWL in a nutshell Ontology definition ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
RDF-S/OWL in a nutshell What does it mean? Formal, explicit specification of a shared conceptualization Machine readable Several people agrees that such conceptual model is adequate to describe such aspects of the reality A conceptual model of some aspects of the reality It makes domain assumption explicit
RDF-S/OWL in a nutshell Questa è un’ontologia? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
RDF-S/OWL in a nutshell Esempio di ontologia ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
RDF-S/OWL in a nutshell Linguaggio Ontologico ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
RDF-S/OWL in a nutshell Le parti di un linguaggio ontologico ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
RDF-S/OWL in a nutshell Strong vs. Weak Semantics? “ A little semantics , goes a long way” [James Hendler, 2001] “ A Little Semantic Web Goes a Long Way in Biology” [ Wolstencroft et al., 2005]
RDF-S/OWL in a nutshell A simple ontology Artist Piece Painter Paint paints Sculptor Sculpt sculpts creates
RDF-S/OWL in a nutshell Specifying classes, sub-classes and instances ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Artist Painter Sculptor Rodin
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],RDF-S/OWL in a nutshell Specifying properties and sub-properties - - creates paints
[object Object]
RDF-S/OWL in a nutshell Specifying domain/range constrains ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
RDF-S/OWL in a nutshell The ontology we specified Artist Piece Painter Paint paints Sculptor Sculpt sculpts creates
RDF-S/OWL in a nutshell RDF-S semantics (a part of it) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
RDF-S/OWL in a nutshell RDF-S semantics at work ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
RDF-S/OWL in a nutshell Without Inference ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
RDF-S/OWL in a nutshell Knowing the ontology and RDF-S semantics … ,[object Object],[object Object],Rodin TheKiss Artist Piece Painter Paint paints Sculptor Sculpt sculpts creates
RDF-S/OWL in a nutshell … a reasoner can answer ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
RDF-S/OWL in a nutshell More expressive power 1/3 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
RDF-S/OWL in a nutshell More expressive power 2/3 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
RDF-S/OWL in a nutshell More expressive power 3/3 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
RDF-S/OWL in a nutshell Expressivity vs. Tractability ,[object Object],[object Object]
RDF-S/OWL in a nutshell OWL 2 profiles ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
RDF-S/OWL in a nutshell OWL 2 EL ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
RDF-S/OWL in a nutshell OWL 2 QL ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
RDF-S/OWL in a nutshell OWL 2 RL ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
RDF-S/OWL in a nutshell RDF -S/OWL Resources ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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Ontologies in RDF-S/OWL

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  • 5. RDF-S/OWL in a nutshell What does it mean? Formal, explicit specification of a shared conceptualization Machine readable Several people agrees that such conceptual model is adequate to describe such aspects of the reality A conceptual model of some aspects of the reality It makes domain assumption explicit
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  • 10. RDF-S/OWL in a nutshell Strong vs. Weak Semantics? “ A little semantics , goes a long way” [James Hendler, 2001] “ A Little Semantic Web Goes a Long Way in Biology” [ Wolstencroft et al., 2005]
  • 11. RDF-S/OWL in a nutshell A simple ontology Artist Piece Painter Paint paints Sculptor Sculpt sculpts creates
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  • 16. RDF-S/OWL in a nutshell The ontology we specified Artist Piece Painter Paint paints Sculptor Sculpt sculpts creates
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Editor's Notes

  1. 07/04/10 © 2005 - Della Valle - CEFRIEL
  2. 07/04/10 © 2005 - Della Valle - CEFRIEL
  3. 07/04/10 © 2005 - Della Valle - CEFRIEL
  4. 07/04/10 © 2005 - Della Valle - CEFRIEL
  5. @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> . @prefix ex: <http://www.ex.org/schema#> . @prefix owl: <http://www.w3.org/2002/07/owl#> . ex:Artist a owl:Class . ex:Piece a owl:Class . ex:Sculptor a owl:Class . ex:Sculptor rdfs:subClassOf ex:Artist . ex:creates a owl:ObjectProperty . ex:creates rdfs:domain ex:Artist . ex:Rodin a ex:Sculptor . ex:TheKiss a ex:Piece . ex:Rodin ex:creates ex:TheKiss .
  6. <RDF> <Description about="Rodin"> <sculpts resource="TheKiss"/> </Description> <Description about="Painting"> <subClassOf resource="Piece"/> </Description> <Description about="sculpts"> <range resource="Sculpt"/> <domain resource="Sculptor"/> <subPropertyOf resource="creates"/> </Description> <Description about="Sculpt"> <subClassOf resource="Piece"/> </Description> <Description about="creates"> <range resource="Piece"/> <domain resource="Artist"/> </Description> <Description about="Sculptor"> <subClassOf resource="Artist"/> </Description> <Description about="Painter"> <subClassOf resource="Artist"/> </Description> </RDF> RDF/Description[@about='Rodin']/sculpts/@resource RDF/Description[sculpts/@resource='TheKiss']/@about