GUIDE : - PRFO. P.R. BARAPATREBY

ABHIJIT C. MANEPATILROLL NO. - CE19

Semantic Web

SKN SIT, LONAVALA

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.

Layered Approach of Semantic Web

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 diagramsShows 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.

Abhijit Pune

RDF

Subject Object

(Predicate)

Stays in

Voting Citizen

Non Voting Citizen

Citizen States

Country

CityTown

Taluka

involes

RDFStype

subclass subclass

RangeDomain

Web with RDF

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 wesiteImproves 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 toolsIts 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.

Scope

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

THANK YOU