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Semantic web technology

Semantic web technology

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  • 1. SKN SIT, LONAVALA Semantic WebG U I D E : - P R F O. P. R . B A R A PAT R E BY A B H I J I T C . M A N E PAT I L RO L L N O. - C E 1 9
  • 2. Contents Introduction. History. Layered approach of Semantic Web. Content of Semantic Web. Need of Semantic Web. Issues and Challenges. Conclusion. References.
  • 3. Introduction Definition : "The Semantic Web is an extension of the current web in which information is given well-defined meaning, better enabling computers and people to work in co-operation.” It is the web of data that can be processed directly & indirectly by machine. It Defines the things in the way that computer application can understand it. Developed by Tim Berner lee.
  • 4. Conti… Web has millions of documents with each one has set of terms. Terms are used to search the documents. E.g. Book written by jone. Semantic web allows to search exact result.
  • 5. History Web 1.0  Read Only era  Static Pages.  e.g.. Wikipedia Web 2.0  Dynamic Pages  Active Interaction  e.g. Facebook, You Tube. Web 3.0  Next Evolution
  • 6. Web 3.0 Semantic Web  Machine Understandable  Intelligence web  More Active Interaction  Defines the specific syntax for web  1) common format for integration & combination of data  2) It is also about the language for recording that how the data relates to real world objects.
  • 7. Layered Approach of Semantic Web
  • 8. Components of the Semantic Web XML Uniform Resource Identifier (URI) Resource Description Framework (RDF) Resource Description Framework Schema (RDFS) Web Ontology Language (OWL)
  • 9. XML HTML and XML XML with structured information XML shows the relationship betn terms of documents Which is machine understandable every peace of info. Is described.
  • 10. Uniform Resource Identifier (URI) Web identifier : like string starting with http or ftp Anyone can create a URI Every resource has URI or a web address URI defines the web location Anything that has a URI is “On the Web‟‟
  • 11. Resource Description Framework (RDF) Family of W3C designed as metadata model. General Methods for conceptual description or modeling of information.(Syntax) Similar to the ER or Class diagrams Shows the relationship between Subject-Predicates- Object (triples) E.g. „The Sky has the color blue‟ RDF abstract model with serialization format (ie file format)
  • 12. RDF Schema Extensible knowledge representation language. Range involes Domain Country Citizen States subclass subclass Voting Non Voting City Taluka Citizen Town Citizen RDFS type RDF Stays in Abhijit Pune (Predicate) Subject Object
  • 13. Web with RDF
  • 14. OWL (Web Ontology Language ) An ontology is an explict and formal specification of a conceptualization. It consist of finite list of terms and relationship betn them. Shared understanding Orgnizing and mapping wesite Improves the accuracy of web search
  • 15. Issues and Challenges It’s Too Complex  The RDF model is felt to be complex  The RDF representation in XML looks complex Industry Isn’t Interested  The Semantic Web won‟t take off unless the IT sector develops tools Its Too Researchy  The Semantic Web is an idea for the AI research community and not for mainstream use Consensus Not Yet Reached On Architectural Approach  There is still debate on RDF, patent issues, etc.
  • 16. Scope
  • 17. Conclusion To conclude:  The first version of the Web lacked a metadata framework which was needed to describe resources  W3C developed RDF to provide this framework  Semantic web is the Future of Internet which will expected to rewrite the internet as we know  Change the way of information search on web  Semantic web can overcome all the traditional problems to provide a better and rich user experience to consumers all over the world.
  • 18. References• IEEE Internet Computing The Semantic Web: The Roles of XML and RDF Stefan Decker And Sergey Melnik Stanford University.• IEEE INTELLIGENT SYSTEMS Ontology Languages for the Semantic Web Asunción Gómez-Pérez and Oscar Corcho, Universidad Politécnica de Madrid.• IEEE Published by the IEEE Computer Society: Semantics Scales Up Beyond Search in Web 3.0• T. Berners-Lee. Semantic Web Road Map