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
Contents Introduction. History. Layered approach of Semantic Web. Content of Semantic Web. Need of Semantic Web. Issues and Challenges. Conclusion. References.
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.
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.
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
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.
Components of the Semantic Web XML Uniform Resource Identifier (URI) Resource Description Framework (RDF) Resource Description Framework Schema (RDFS) Web Ontology Language (OWL)
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.
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‟‟
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)
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
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
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.
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.
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