Semantic Web ServicesA RESTful Approach

Otávio Freitas Ferreira FilhoMaria Alice Grigas Varella Ferreira

University of São PauloPolytechnic School

IADIS International Conference WWW/INTERNET 2009Rome, Italy20/11/2009

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Topics

•Objective•Web 2.0•Web Services•RESTful Web Services•Semantic Web Services•RESTful Semantic Web Services•The RESTfulGrounding Ontology•Conclusions

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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

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Web 2.0

•Collaborative, social applications•Content consumption and, mainly,

production•Network effects•Web services for data extraction and

reuse

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Web Services

•Web-based components•Interoperable communication over

networks•Classification:

▫RPC▫RESTful

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RESTful Web Services

•REST: architectural style for distributed systems

•RESTful: REST + HTTP•Syntactic description: WADL

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

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RESTful Web Services / Principles•Addressability•Statelessness•Connectedness

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Semantic Web Services

•Semantic layer for automated service discovery, composition, monitoring, and execution

•Offer both syntactic and semantic descriptions

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Access Syntax Semantics

RPC SOAP WSDL OWL-S

RESTful HTTP WADL OWL-S

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Semantic Web Services

•OWL-S: Upper ontology for services

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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)

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The RESTfulGrounding Ontology

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The RESTfulGrounding Ontology01 <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>

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The RESTfulGrounding Ontology01 <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>

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Conclusions

•Proposed mapping is possible: OWL-S/WADL

•Coexistence of mappings also possible

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Thank You!

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Grazie

http://FullSemanticWeb.com/