Rdf And Rdf Schema For Ontology Specification
- 1. Mobile Web Services RDF and RDF Schema for ontology specification Presenter: Chen Jen
- 2. Outline Introduction RDF discussion Beyond RDF Schema Reference
- 3. Introduction Metadata decide data’s importance by self No require human or computer to determine its relevance Metadata need accepted vocabulary
- 4. Introduction Resource Description Framework (RDF) was developed Uniform Resource Identifiers (URIs) identify resources Assertion format is based on XML notation
- 5. Introduction Resource assertion has three objects Resource itself Property name Statement Three objects is the same in RDF Subject Predicate object
- 6. RDF discussion RDF application RDF graph models RDF XML syntax RDF vocabularies and schemas RDF schema language
- 7. RDF applications Mobile terminal capabilities Adapt their content for each terminal Screen size, screen resolution, color support etc. Indicate relative degrees of preference Client prefers markup quality
- 8. RDF applications User privacy preferences Network access constraints Specify on WLAN or cellular network
- 9. RDF graph models (1) (2) (3) (4)
- 10. RDF graph models Resource = Source node (1) Property name = Arc (2) Property value = Final node (3) Structured information resource = Blank node (4)
- 11. RDF XML syntax
- 12. RDF XML syntax < rdf:RDF > = RDF resource representation XML namespace xmlns:rdf for W3C RDF specific term xmlns:prf for WAP Forum’s UAProf term Term prefixed with rdf correspond W3C URI prf correspond WAP Forum URI
- 13. RDF XML syntax < Description > is Describe resource Likeness of nested element
- 14. RDF XML syntax
- 15. RDF XML syntax Domain is defined by another associated resource URI < comment > replace RDF <value> DTD (Document Type Definition) can be used in XML
- 16. RDF XML syntax <Bag> = unordered group of resources rdf:Bag <Sequence> = ordered group rdf:Seq <Alternative> = alternative values rdf:Alt < rdf:li > = separate line item
- 17. RDF vocabularies and schemas Vocabulary = collection of resources and properties PDA, Phone, GPS, etc. RDF schema is used by object-oriented Namespace rdfs = RDF schema vocabulary
- 19. RDF schema language - RDFS class Class = Resource rdf:type property = rdf:Class Rdfs:subClassOf = parent resource MobileTerminal is class Phone, PDA are subclasses
- 20. RDF schema language – RDFS properties and property constraints rdf:type value is rdf:Property domain constrain property to be associated with certain resources range define that property can have value rdfs:subProperyOf property is organized. GIFcapable is sub-property of UAProf’s ImageCapable property
- 21. RDF schema language – Component design with RDFS Property-centric specification has many benefits Independently of class No need to redefine Object-oriented programming language No include all applicable properties
- 22. Beyond RDF Schema The Web Ontology Language (OWL) Defense Advanced Research Projects Agency (DARPA) DARPA Agent Markup Language (DAML) Facilitate the concept of the Semantic Ontology Inference Layer (OIL) Knowledge-representation research
- 23. Beyond RDF Schema OWL is published as W3C Need of different community Different levels of ontology sophistication OWL Description Logics (DL) Require strict type OWL Full No have any limitation
- 24. Beyond RDF Schema OWL-based Web Service Ontology (OWL-S) Automation of services on the Semantic Web Core set of markup language construct Automation of task Web service discovery Invocation Composition and interoperation Execution monitoring
- 25. Beyond RDF Schema Web service discovery Automatic offer specific services Web service invocation Web service function to invoke Interoperation and composition Multiple Web services combine a composite service
- 26. Beyond RDF Schema Monitoring track Aware and progress of their request
- 27. Reference Ariel Pashtan, Mobile Web Service. Page 138 ~153.