Semantic Web Services: A RESTful Approach

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

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

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

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

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

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

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

RESTful Web Services / Principles
Addressability
Statelessness
Connectedness
8

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

OWL-S: Upper ontology for services
10

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

14

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

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

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

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

Semantic Web Services: A RESTful Approach

by Otavio Ferreira

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