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The document proposes a data model for representing a network of linked semantic web services. It consists of three modules: functional, business, and service level agreement. The model reuses existing vocabularies and allows embedding links between services. The author encodes a dataset of 753 web service description language files into the resource description framework using the proposed model. Links between services are generated through schema matching. This results in over 300,000 rdf triples representing the network of semantic web services.
Presentation
- 1. Towards the Network of Linked Semantic Web Services Svetlana Omelkova IKTDK Annual Conference December 6, 2014
- 2. Introduction Web Services Web Service (WS) is a method of communication between two electronic devices over the Web. WS has an interface described in a machine-readable format WSDL (Web Service Description Language) Systems communicate using special protocol SOAP (Simple Object Access Protocol) Svetlana Omelkova IKTDK Annual Conference December 6, 2014 2 / 17 Service Requester Service Provider SOAP SOAP Discovery Agent Publish WSDLFind WSDL
- 3. Introduction Semantic Web Services (SWS) SWS is an attempt to enrich machine-readable WS representation with semantics Number of conceptual models available: Svetlana Omelkova IKTDK Annual Conference December 6, 2014 3 / 17 Top-down view WSMO OWL-S ... Bottom-up view SA-WSDL WSMO-Lite ...
- 4. Introduction Semantic Web Services (SWS). Other models Linked USDL vocabulary to capture WS trading over the Web usdl-core usdl-agreement usdl-price usdl-sla usdl-security Minimal Service Model (MSM) common vocabulary that describes WS functionality Svetlana Omelkova IKTDK Annual Conference December 6, 2014 4 / 17
- 5. Introduction Semantic Web and the Web of Data Semantic Web is a new form of Web content that is meaningful to computers The Web of Data based on 4 principles: URIs as name for things HTTP URIs Use standards (RDF, SPARQL) Links to other pieces of data Bunch of technologies RDF Schema(RDF(S)) Web Ontology Language (OWL) Tools (i.e. ontology editors) Storage and querying systems Reasoners Svetlana Omelkova IKTDK Annual Conference December 6, 2014 5 / 17
- 6. Introduction Semantic Web and the Web of Data. RDF Svetlana Omelkova IKTDK Annual Conference December 6, 2014 6 / 17 subject predicate object http://deepweb.ut.ee/services/science_fiction_service.wsdl http://www.w3.org/1999/02/22-rdf-syntax-ns#/type http://deepweb.ut.ee/ontologies/api-network#WebService OR Api-network: science_fiction_service.wsdl Api-network:WebService RDF:type
- 7. Introduction Semantic Web and the Web of Data. RDF. Example 2 Svetlana Omelkova IKTDK Annual Conference December 6, 2014 7 / 17 Api-network: science_fiction_service.wsdl Api-network:WebService RDF:type Api-network:communication Api-network:hasClassification Api-network: science_fiction_operation Api-network:hasOperation
- 8. Introduction Network of Web Services No uni鍖ed way to combine WSs into network Svetlana Omelkova IKTDK Annual Conference December 6, 2014 8 / 17 op11 op12 op21 op31 a b c d e f g h i j k ws1 ws2 ws3Web service node Operation node Parameter node Parameter-parameter network a b c d e f g k j i h Operation-operation network op11 op12 op21 op31 Web service-Web service network WS1 WS2 WS3
- 9. Introduction Network of Linked SWS Problem: There is no model available to represent the network of SWS Idea: to combine mentioned technologies Svetlana Omelkova IKTDK Annual Conference December 6, 2014 9 / 17 SWS + Linked Data + Network of WS = Network of Linked SWS
- 10. Proposed Data Model Consists of three modules: Functional Business Service Level Agreement Svetlana Omelkova IKTDK Annual Conference December 6, 2014 10 / 17 Functional Part Business Part SLA Part Functional Service Business Service SLA profile Communication Channel
- 11. Proposed Data Model Business Part Svetlana Omelkova IKTDK Annual Conference December 6, 2014 11 / 17 usdl-core:Service usdl-core:hasInteractionPoint gr:BusinessEntity usdl-core:InteractionPoint usdl-core:CommunicationChannel usdl-core:hasCommunicationChannel usdl-core:EntityInvolvment usdl-core:ofBusinessEntity usdl-core:BusinessRole usdl-core:Role scos:Concept rdfs:subClassOf rdfs:subClassOf Producer Provider Customer Consumer BusinessRole Individuals skos:Concept Business part Intermediary usdl-core:withBusinessRole usdl-core:hasEntityInvolvment
- 12. Proposed Data Model Service Level Agreement (SLA) Part Svetlana Omelkova IKTDK Annual Conference December 6, 2014 12 / 17 usdl-sla:ServiceLevelProfile usdl-sla:ServiceLevel usdl-sla:ServiceLeveExpressionl usdl-sla:hasServiceLevel usdl-sla:ServiceLevelExpression usdl-sla:Variable usdl-sla:hasVariable Availability OperationHours ReactionTime Reliability RequestsPerMinute ResponceTime SingleFailureDuration Variable Individuals SLA part
- 13. Proposed Data Model Functional Part Svetlana Omelkova IKTDK Annual Conference December 6, 2014 13 / 17 API msm:Operation msm:hasOperation scos:Concept hasClassification Mashup gr:include gr:Offering rdfs:subClassOf Dataset gr:include rdfs:subClassOf rdfs:subClassOf Match Parameter msm:hasOutput msm:hasInput msm:MessageContent rdfs:subClassOf rdf:Resource sawsdl:modelReference hasOutput hasInput gr:ProductOrService rdfs:subClassOf hasInput hasOutput WebService OperationMatch ParameterMatch WSMatch rdfs:subClassOf hasInput hasOutput msm:Service owl:equivalentClass Functional part gr:Individual rdfs:subClassOf rdfs:subClassOf
- 14. Dataset SAWSDL-TC3 Dataset 753 unique WSDL 鍖les 9 classi鍖cation domains WSDL 1.1 language One operation per service Dataset encoded in RDF using proposed model Links between WSs are constructed using Schema matching between services interfaces As a result 334061 RDF triplets Svetlana Omelkova IKTDK Annual Conference December 6, 2014 14 / 17
- 15. Application DEMOhttp://deepweb.ut.ee/services/api-network-sawsdl-tc3.rdf http://localhost:3030 Svetlana Omelkova IKTDK Annual Conference December 6, 2014 15 / 17
- 16. Conclusion Presented the data model for Network of SWS Reused existing models (Linked USDl, MSM) Our solution provides 鍖exible way to embed any other links between services and other related entities Encode SAWSDL-TC3 dataset into RDF using proposed model Available online at http://deepweb.ut.ee/services/ api-network-sawsdl-tc3.rdf Svetlana Omelkova IKTDK Annual Conference December 6, 2014 16 / 17
- 17. Svetlana Omelkova IKTDK Annual Conference December 6, 2014 17 / 17 Thank you!