CSE 428 Semantic Web Topics Introduction Jeff Heflin Lehigh University.

Slides:



Advertisements
Similar presentations
CH-4 Ontologies, Querying and Data Integration. Introduction to RDF(S) RDF stands for Resource Description Framework. RDF is a standard for describing.
Advertisements

Semantic Web Thanks to folks at LAIT lab Sources include :
CS570 Artificial Intelligence Semantic Web & Ontology 2
1 Semantic Web Technologies: The foundation for future enterprise systems Okech Odhiambo Knowledge Systems Research Group Strathmore University.
The Web of data with meaning... By Michael Griffiths.
Ontology Notes are from:
Ontologies and the Semantic Web by Ian Horrocks presented by Thomas Packer 1.
Dynamic Ontologies on the Web Jeff Heflin, James Hendler.
Semantic Web Tools for Authoring and Using Analysis Results Richard Fikes Robert McCool Deborah McGuinness Sheila McIlraith Jessica Jenkins Knowledge Systems.
COMP 6703 eScience Project Semantic Web for Museums Student : Lei Junran Client/Technical Supervisor : Tom Worthington Academic Supervisor : Peter Strazdins.
The Semantic Web Week 1 Module Content + Assessment Lee McCluskey, room 2/07 Department of Computing And Mathematical Sciences Module.
Intelligent Systems Semantic Web. Aims of the session To introduce the basic concepts of semantic web ontologies.
Semantic Web Presented by: Edward Cheng Wayne Choi Tony Deng Peter Kuc-Pittet Anita Yong.
From SHIQ and RDF to OWL: The Making of a Web Ontology Language
Samad Paydar Web Technology Laboratory Computer Engineering Department Ferdowsi University of Mashhad 1389/11/20 An Introduction to the Semantic Web.
OntoWeb SIG 2: Ontology Language Standards Heiner Stuckenschmidt Vrije Universiteit Amsterdam With contributions from: Ian Horrocks and Frank van Harmelen.
Computer communication B Introduction to the Semantic Web.
Module 2b: Modeling Information Objects and Relationships IMT530: Organization of Information Resources Winter, 2007 Michael Crandall.
Knowledge Representation Issues for the Semantic Web Jeff Heflin Lehigh University.
Editing Description Logic Ontologies with the Protege OWL Plugin.
Semantic Web Technologies Lecture # 2 Faculty of Computer Science, IBA.
CSE 428 Semantic Web Topics Introduction Jeff Heflin Lehigh University.
Ontologies: Making Computers Smarter to Deal with Data Kei Cheung, PhD Yale Center for Medical Informatics CBB752, February 9, 2015, Yale University.
1 Semantic Technologies: Diamond in the Rough? Unik Graduate Research Center Dr. Juan Miguel Gomez Universidad Carlos III de Madrid.
Aidministrator nederland b.v. Adding formal semantics to the Web Jeen Broekstra, Michel Klein, Stefan Decker, Dieter Fensel,
Chapter 6 Understanding Each Other CSE 431 – Intelligent Agents.
Practical RDF Chapter 1. RDF: An Introduction
1cs The Need “Most of the Web's content today is designed for humans to read, not for computer programs to manipulate meaningfully.” Berners-Lee,
Okech Odhiambo Faculty of Information Technology Strathmore University
The Semantic Web Service Shuying Wang Outline Semantic Web vision Core technologies XML, RDF, Ontology, Agent… Web services DAML-S.
The Semantic Web William M Baker
Logics for Data and Knowledge Representation
Chapter 6 Understanding Each Other CSE 431 – Intelligent Agents.
SWETO: Large-Scale Semantic Web Test-bed Ontology In Action Workshop (Banff Alberta, Canada June 21 st 2004) Boanerges Aleman-MezaBoanerges Aleman-Meza,
Enabling Access to Sound Archives through Integration, Enrichment and Retrieval WP2 – Media Semantics and Ontologies.
Semantic Web - an introduction By Daniel Wu (danielwujr)
1 Metadata –Information about information – Different objects, different forms – e.g. Library catalogue record Property:Value: Author Ian Beardwell Publisher.
Advanced topics in software engineering (Semantic web)
©Ferenc Vajda 1 Semantic Grid Ferenc Vajda Computer and Automation Research Institute Hungarian Academy of Sciences.
updated ’08CmpE 583 Fall 2008Introduction- 1 CmpE 583- Web Semantics: Theory and Practice Atilla ELÇİ Computer Engineering Department Eastern.
Grid Computing & Semantic Web. Grid Computing Proposed with the idea of electric power grid; Aims at integrating large-scale (global scale) computing.
EEL 5937 Ontologies EEL 5937 Multi Agent Systems Lecture 5, Jan 23 th, 2003 Lotzi Bölöni.
It’s all semantics! The premises and promises of the semantic web. Tony Ross Centre for Digital Library Research, University of Strathclyde
Artificial Intelligence 2004 Ontology
The future of the Web: Semantic Web 9/30/2004 Xiangming Mu.
OWL Representing Information Using the Web Ontology Language.
Introduction to the Semantic Web and Linked Data Module 1 - Unit 2 The Semantic Web and Linked Data Concepts 1-1 Library of Congress BIBFRAME Pilot Training.
Dr. Lowell Vizenor Ontology and Semantic Technology Practice Lead Alion Science and Technology Semantic Technology: A Basic Introduction.
Metadata : an overview XML and Educational Metadata, SBU, London, 10 July 2001 Pete Johnston UKOLN, University of Bath Bath, BA2 7AY UKOLN is supported.
6 Dec Rev. 14 Dec CmpE 583 Fall 2008OWL Intro 1 OWL Intro Notes off Lacy Ch. 4 Atilla Elçi.
THE SEMANTIC WEB By Conrad Williams. Contents  What is the Semantic Web?  Technologies  XML  RDF  OWL  Implementations  Social Networking  Scholarly.
CS621 : Artificial Intelligence Pushpak Bhattacharyya CSE Dept., IIT Bombay Lecture 12 RDF, OWL, Minimax.
References [1] D:\My Documents\SemanticWebWorkshop\kaynak\Ian Horrocks - CS646\intro-2004.pptD:\My Documents\SemanticWebWorkshop\kaynak\Ian Horrocks -
CSE 428 Semantic Web Topics Introduction Jeff Heflin Lehigh University.
The Semantic Web. What is the Semantic Web? The Semantic Web is an extension of the current Web in which information is given well-defined meaning, enabling.
A Portrait of the Semantic Web in Action Jeff Heflin and James Hendler IEEE Intelligent Systems December 6, 2010 Hyewon Lim.
Introduction to the Semantic Web Jeff Heflin Lehigh University.
Social Information Processing March 26-28, 2008 AAAI Spring Symposium Stanford University
06 Dec Rev. 14 Dec CmpE 583 Fall 2008 OWL Language 1 OWL Language off Lacy Ch. 10 Atilla Elçi.
OWL Web Ontology Language Summary IHan HSIAO (Sharon)
Web Design Terminology Unit 2 STEM. 1. Accessibility – a web page or site that address the users limitations or disabilities 2. Active server page (ASP)
Semantic Web. P2 Introduction Information management facilities not keeping pace with the capacity of our information storage. –Information Overload –haphazardly.
OWL (Ontology Web Language and Applications) Maw-Sheng Horng Department of Mathematics and Information Education National Taipei University of Education.
The Semantic Web By: Maulik Parikh.
Chapter 6 Understanding Each Other
OWL Language off Textbook Ch. 10
Grid Computing 7700 Fall 2005 Lecture 18: Semantic Grid
Grid Computing 7700 Fall 2005 Lecture 18: Semantic Grid
Semantic Web Update W3C RDF, OWL Standards, Development and Applications Dave Beckett.
Presentation transcript:

CSE 428 Semantic Web Topics Introduction Jeff Heflin Lehigh University

The Semantic Web u “Semantic” + “Web” –Semantic: "of or relating to meaning in language" (Def. Webster’s) –Web: The World Wide Web u Official Definition –The Semantic Web is not a separate Web but an extension of the current one, in which information is given well-defined meaning, better enabling computers and people to work in cooperation. (Berners-Lee et al., Scientific American, May 2001)

Why Study Semantic Web? u Open source Semantic Web tools –from IBM, Hewlett-Packard, Nokia, etc. u Commercial software vendors –Oracle 11g RDBMS supports RDF and much of OWL –Adobe’s products use RDF to provide metadata for documents, photos –Semantic Web specific companies: TopQuadrant, Aduna Software, etc. u ~65 million Semantic Web documents (as of October 2009) –Yahoo SearchMonkey uses RDF to present richer search results –Google now indexes RDFa (a means for embedding RDF in web pages) u Semantic Web enabled sites –Data.gov: much of U.S. government’s open data is available in RDF –Newsweek: annotates articles with RDFa –BBC Music: exports RDF playlists, RDF for all artists –Harper’s Magazine: connects articles to events on a timeline –DBPedia: a Semantic Web version of Wikipedia

4 of 30 Semantic Web Standards u RDF(S) (1999, revised 2004) –essentially semantic networks with URIs –XML serialization syntax u OWL (2004) –extends RDF with more semantic primitives –based on description logics (DLs) –has a model theoretic semantics World Wide Web Consortium (W3C) Recommendations u:Chair John Smith rdf:type g:name g:Person g:name rdfs:Classrdf:Property rdf:type rdfs:subclassOf rdfs:domain A Band is a subset of the groups which only have Musicians as members

Semantic Web Layer Cake 5 of 30 From W3C (March 2007)

6 of 30 The End

7 of 30 Motivation u How to answer these queries? –find all bills dealing with “energy” that have been sponsored by Congressmen from states with populations less than 1 million –retrieve a list of all papers authored by NSF- funded individuals who are located in states in the Midwest –find a potential collaborator by identifying a friend-of-a-friend who has written an article on a related topic

8 of 30 The Semantic Web u Definition –The Semantic Web is not a separate Web but an extension of the current one, in which information is given well-defined meaning, better enabling computers and people to work in cooperation. (Berners-Lee et al., Scientific American, May 2001) u Ontology –a key component of the Semantic Web –ontologies define the semantics of the terms used in semi- structured web pages »identify context, provide shared definitions »has a formal syntax and unambiguous semantics –inference algorithms can compute what logically follows

9 of 30 A Web of Ontologies Foaf DBLP Congress Citeseer AIGPNSF Awards extends S3S3 S7S7 commits to The answer to a user’s query might require the combination of data from S 1, S2, S3, and S 4. Region S1S1 S2S2 Dublin Core S5S5 extends S4S4 S6S6 commits to extends

10 of 30 URIs and Namespaces u URI –Uniform Resource Identifier –includes URLs –but also anything that you can design an identification scheme for –helps to prevent collision of names –all the “symbols” in RDF are either URIs or Literals u Namespace –a mechanism for abbreviating URIs –by assigning a prefix for a URI fragment

11 of 30 Description Logic (DL) u form of knowledge representation –useful for formally defining classes –studied extensively in 1990’s –mature reasoning software »e.g., FaCT, RACER, Pellet u benefits –optimized computation of subsumption »calculate implicit subClassOf relations –ontology integration »if two ontologies are related via class expressions then subsumption can be used to compute an integrated ontology

12 of 30 OWL Class Constructors example taken from Ian Horrocks

13 of 30 OWL Axioms example taken from Ian Horrocks

14 of 30 Common Criticisms u Who will create all of the RDF/OWL data? u How do you integrate heterogeneous ontologies? u How can you handle spam / deceit / misinformation? u How can a system based on formal logic achieve Web scale?

15 of 30 Semantic Web Challenges u The Web is distributed –many sources, varying authority –inconsistency u The Web is dynamic –representational needs may change u The Web is enormous –systems must scale well u The Web is an open-world

16 of 30 Semantic Web Timeline Mar SHOE 0.90 (simple frames in HTML) Jan – SHOE 1.0 (frames + Horn logic) Feb – XML (semi- structured data for Web) Sep – Berners-Lee’s Semantic Web Roadmap Feb – RDF (semantic nets in XML) Mar – DAML+OIL (expressive DL in RDF) May 2001 – Berners-Lee et al. Scientific American article June – 1 st Int’l Semantic Web Conference Feb – OWL (W3C Rec.)