Introduction to Semantic Web

INTRODUCTION TO SEMANTIC WEBCS 1150 – INTRODUCTION TO COMPUTER SCIENCE

BY - SANJAYA WIJERATNE

2

OVERVIEW

• What is Semantic Web?• Evolution of the Web• Semantic Web Technologies• Applications of Semantic Web

3

4

WHAT IS SEMANTIC WEB?

The Semantic Web is the extension of the World Wide Web that enables people to share content beyond the boundaries of

applications and websites. It has been described in rather different ways: as a utopic vision, as a web of data, or merely as a natural

paradigm shift in our daily use of the Web. Most of all, the Semantic Web has inspired and engaged many people to create innovative

semantic technologies and applications.

Source – http://semanticweb.org/wiki/Main_Page

5

Source – http://blogs.voices.com/thebiz/2006/09/web_20_definition.html Source – http://www.evolvedmommy.com/web2-0/

6

Source – http://www.gadgetsmagazine.com.ph/good-finds/ibms-watson-crushes-human-opposition-in-jeopardy-robot-uprising-not-far-behind.html

Source – http://www.electricpig.co.uk/2011/12/16/iphone-4s-jailbreak-incredible-siri-hack-lets-you-shout-settings/

7

8

COMPARISON – WEB 1.0, WEB 2.0 AND WEB 3.0

Web 1.0 Web 2.0 Web 3.0Page Content Mostly Read Only (Static) Widely Read-Write Portable and Personal

Web Page Types Mostly Home/Company Pages Blogs, Wiki, Social Media, Information Sharing

Streaming Data with Real-time updates

Application Types Web Forms Web Applications Smart Applications

Content Usage Publishers Owned Content Communities Shared Content

Applications Shared and Consolidated Content

Knowledge Seeking Encyclopedias (Eg – Britannica) Social Knowledge-bases Web of Data

Technologies HTML XML/RSS RDF/RDFS/OWL

Semantic Web Introduction Video – http://goo.gl/zB8BW

9

10

11

SEMANTIC WEB TECHNOLOGIES

• OWL (Web Ontology Language) – Use to Represent

Knowledge in Semantic Web Applications• Eg – Egg is a Concept. Egg has 6g of Protein.

• RDF/RDFS (Resource Description Framework) – Data Modelling Language for Semantic Web. All data are stored as RDF triples• Eg – <domain:Egg> < domain:has> <domain:Protein>

• SPARQL (SPARQL Protocol and RDF Query Language) – Used to Query RDF DatasetsSource – http://www.semanticfocus.com/blog/entry/title/introduction-to-the-semantic-web-vision-and-technologies-part-1-overview/

12

APPLICATIONS OF SEMANTIC WEB

• Widely Known Applications• Google Knowledge Graph• IBM Watson• Apple’s SIRI

• Developed at Kno.e.sis• Twitris and many others

Source – http://www.cityofcarver.com/2013/09/thank-you-steamboat-days-committee/