Unit-IV; Professional Sales Representative (PSR).pptx
The semantic web
1. SKN SIT, LONAVALA
Semantic Web
G 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.
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
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.
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