1. RDF (Resource Description Framework)

2. 2 Table of Contents  Introduction  Basic RDF –Basic RDF Model –Basic Syntax  Containers  Statements about Statements  examples

3. 3 Introduction  Conception –Foundation for processing metadata. –Provides interoperability between Applications that exchange machine-understandable information on the Web. –A Model for representing RDF metadata. –A Syntax for encoding and Transporting this metadata in a manner. ( using of XML Syntax) –Have a Class System much like OOP.

4. 4 Introduction  using –Resource discovery. –Digital library. –Intelligent software agents. –Privacy Policies. –Etc..

5. 5 Basic RDF Model No1  A Model for representing named properties and property values  A Syntax-neutral way of representing RDF expressions  Consists of Object types –Resource –Properties –Statements

6. 6 Basic RDF Model No2  Resources –ALL things being described by RDF expressions are called resources  Properties –A Property is a specific aspect, characteristic, attribute or relation used to describe a resource  Statements –A specific resource together with a named property plus the value of that property for that resource is an RDF statment

7. 7 Basic RDF Model No3 Subject(Resource)http://www.w3c.org/Home/Lassila Predicate(Propery)Creator Object(literal)“Ora Lassila”  sentence Ora Lassila the creator of the resource http://www.w3c.org/Home/Lassila

8. 8 Basic RDF Model (Simple node and arc diagram) http://www.w3c.org/Home/Lassila Ora Lassila Creator The graph consists of two nodes connected by a single arc. One node (represented as an oval) contains the URI text http://www.w3.org/Home/Lassila and the other (represented as a rectangle) contains the text "Ora Lassila". The arc connecting these nodes bears the label Creator.

9. 9 Basic RDF Model (Property with structured Value) http://www.w3c.org/Home/Lassila Lassila@w3.org Creator Ora Lassila Name Email  sentence The individual whose name is Ora Lassila, email, is the creator of http://www.w3.org/Home/Lassila.

10. 10 Basic RDF Model (Structured value with identifier) http://www.w3c.org/Home/Lassila Lassila@w3.org Creator Ora Lassila http://www.w3.org/staffId/85740 Name Email  sentence The individual referred to by employee id 85740 is named Ora Lassila and has the email address lassila@w3.org. The resource http://www.w3.org/Home/Lassila was created by this individual.

11. 11 Basic RDF Syntax No1  RDF data model provides an abstract, conceptual framework for defining and using metadata  Concrete syntax is also needed for the purpose of creating and exchanging this metadata  Syntax descriptions in this document use the Extended Backus-Naur Form notation of [XML] to describe the essential RDF Syntax elements  Define two XML Syntax for encoding an RDF data model instance

12. 12 Basic RDF Syntax No2  Serialization Syntax Express –The RDF XML syntax has been designed to accomodate this easily by grouping multiple statements for the same resource into a Description element  Abbreviated Syntax Express –Describle to use a more compact XML form –Three forms of abbreviation are defined for the basic serialization syntax

13. 13 Serialization Syntax Express  sentence Ora Lassila is the creator of the resourcehttp://www.w3c.org/Home/Lassila <rdf:RDF xmlns:rdf = “http://www.w3c.org/1999/02/22-rdf-syntax-ns#” xmlns:s = “http://description.org/schema/ “ > Ora Lassila

14. 14 Abbreviated Syntax Express  The first is usable for properties that are not repeated within a Description and where the values of those properties are literals

15. 15 Abbreviated Syntax Express World Wide Web Consortium W3C Home Page 1998-10-03T02:27 <rdf:Description about="http://www.w3.org" s:Publisher="World Wide Web Consortium" s:Title="W3C Home Page" s:Date="1998-10-03T02:27"/>

16. 16 Abbreviated Syntax Express  The second RDF abbreviation form works on nested Description elements  Sentence The individual referred to by employee id 85740 is named Ora Lassila and has the email address lassila@w3.org. The resource http://www.w3.org/Home/Lassila was created by this individual.

17. 17 Abbreviated Syntax Express Ora Lassila lassila@w3.org

18. 18 Abbreviated Syntax Express Ora Lassila lassila@w3.org

19. 19 Abbreviated Syntax Express <s:Creator rdf:resource="http://www.w3.org/staffId/85740" v:Name="Ora Lassila" v:Email="lassila@w3.org" />

20. 20 Abbreviated Syntax Express <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:s="http://description.org/schema/"> Ora Lassila lassila@w3.org

21. 21 Abbreviated Syntax Express Ora Lassila lassila@w3.org

22. 22 Reference  W3C RDF –http://www.w3c.org/rdfhttp://www.w3c.org/rdf –Resource Description Framework (RDF) Model and Syntax Specification