Presentation given at the IADIS International Conference WWW/Internet 2009, in Rome, Italy. November/09. More info: http://otaviofff.github.io/restful-grounding/

1. IADIS International Conference WWW/INTERNET 2009 Rome, Italy 20/11/2009 Semantic Web Services A RESTful Approach Otávio Freitas Ferreira Filho Maria Alice Grigas Varella Ferreira University of São Paulo Polytechnic School

2. Topics Objective Web 2.0 Web Services RESTful Web Services Semantic Web Services RESTful Semantic Web Services The RESTfulGrounding Ontology Conclusions 2

3. Objective To promote the inclusion of RESTful Web services powering the Web 2.0 into the semantic world, potentially speeding up the adoption of the Semantic Web as a whole 3

4. Web 2.0 Collaborative, social applications Content consumption and, mainly, production Network effects Web services for data extraction and reuse 4

5. Web Services Web-based components Interoperable communication over networks Classification: RPC RESTful 5

6. RESTful Web Services REST: architectural style for distributed systems RESTful: REST + HTTP Syntactic description: WADL 6

7. RESTful Web Services / Concepts Resource Representation Uniform Identifier Unified Interface Execution Scope 7

8. RESTful Web Services / Principles Addressability Statelessness Connectedness 8

9. Semantic Web Services Semantic layer for automated service discovery, composition, monitoring, and execution Offer both syntactic and semantic descriptions 9

10. Semantic Web Services OWL-S: Upper ontology for services 10

11. 11

12. RESTful Semantic Web Services Follow the addressability principle Follow the statelessness principle Follow the connectedness principle Support the unified interface (HTTP) Offer syntactic description (WADL) Offer semantic description (OWL-S) 12

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14. The RESTfulGrounding Ontology 14

15. The RESTfulGrounding Ontology 01 <owl:Class rdf:ID="WadlGrounding"> 02 <rdfs:subClassOf rdf:resource="&grounding;#Grounding"/> 03 <rdfs:subClassOf> 04 <owl:Restriction> 05 <owl:onProperty 06 rdf:resource="&grounding;#hasAtomicProcessGrounding"/> 07 <owl:allValuesFrom 08 rdf:resource="#WadlAtomicProcessGrounding"/> 09 </owl:Restriction> 10 </rdfs:subClassOf> 11 </owl:Class> 15

16. The RESTfulGrounding Ontology 01 <owl:Class rdf:ID="WadlAtomicProcessGrounding"> 02 <rdfs:subClassOf rdf:resource="&grounding;#AtomicProcessGrounding"/> 03 <rdfs:subClassOf> 04 <owl:Restriction> 05 <owl:onProperty rdf:resource="#wadlResourceMethod"/> 06 <owl:cardinality rdf:datatype="&xsd;#nonNegativeInteger">1 07 </owl:cardinality> 08 </owl:Restriction> 09 </rdfs:subClassOf> 10 </owl:Class> 16

17. Conclusions Proposed mapping is possible: OWL-S/WADL Coexistence of mappings also possible 17

18. ThankYou! 18 Grazie http://FullSemanticWeb.com/