The Semantic Web Reference Application Tutorial

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The Semantic Web Reference Application Tutorial

Ryan Blace [email protected]

Mike Dean [email protected]

John Hebeler [email protected]

Andrew Perez-Lopez [email protected]

The Fourth Semantic Interoperability for EGovernment ConferenceFebruary 10,2006

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BBN

• Semantic Web Supporter and Contributor– Standards– Tools– Applications

• Broad Support for Complementary Areas– Distributed computing, agents, networks, security,…

• “Your Semantic Guides”…

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Agenda

• Overview– Philosophies and Goals– Terms, Tools, and Technologies– Tutorial Methodology– Problem Outline

• Begin with the End in Mind– Final Assembled Site– Explore Source Sites– Explore Assembled Site

Note: Open Source Tutorial, Code, and Running Example

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Philosophy

• Simple and Direct

• Examples Illustrate Semantic Web Advantages

– Working illustrations over PowerPoint Hubris and Aggrandizing

• Addressed Problem is Merely for Exploring Semantic Web Constructs And Issues

• Questions welcome…– Long winded questions accepted in written

format only

• Welcome Contributions and Comments– A place to play and learn…

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Why do we need the Semantic Web?

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Terms, Tools, and Technologies

• Terms– Ontology, Instance Data, Knowledgebase, URI, URL, and

Query

• Tools– Protégé, CMAP, SWeDE– Jena

• Technologies– OWL, RDF, & XML– Supporting Technologies: Tomcat, Java, and MySQL

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Tutorial Methodology

• On-Line Tutorial and Open Source Application– Two level tutorial available at http://refapp.projects.semwebcentral.org/On-

line dedicated individual study – we will examine key parts– Open source available at http://projects.semwebcentral.org/frs/?group_id=83

• Tutorial Driven By– Code and ontology snippets– Running examples

• Tutorial Outline– Simple Ontology– Problem and Architecture Overview– “Begin with the End in Mind” first – Semantic Integration Site– Break and Class Exercise– Examine the three distinct source sites– Examine Integration techniques

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Ontology Introduction

• Ontology– Class: foaf:Organization, foaf:Image, foaf:Document – Properties (Relationship): foaf:knows, foaf:surname, foaf:interest

• Can be Class to Class or Class to data type

– Restrictions: inverse of, cannot be (disjoint), cardinality, classes/datatypes

– Inheritance: Person Worker Clerk Seniorclerk• Multiple inheritance: employed father = worker and father• Classes and properties

• Instance– Data encoded to (=>)a particular ontology– i.e. BBN, , [email protected], Mike Dean, Hebeler,

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Problem Overview

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Architecture Overview

Jena

JenaJenaJena

XML

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Ok, Lets Get Going…

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But first…

• Break Time

• Class Exercise– List 5+ types of individuals that work for your organization

and the types of relationships between them

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Tutorial Flow

• Source Sites– Contractor (from scratch)– Project (from relational database)– Weather (from active XML web service)

• Integrated Site – Project Management

• Summary

• Questions etc.

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Summary

• Creation of Content– From scratch– From relational database– From XML web service

• Integration of Knowledge– Mapping and alignment

• Interesting Extensions– SWRL– OWL-S– Others?

• Explore the Site and Contribute…

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Questions??

http://refapp.projects.semwebcentral.org/

Ryan Blace [email protected]

Mike Dean [email protected]

John Hebeler [email protected]

Andrew Perez-Lopez [email protected]

The Semantic Web Reference Application Tutorial

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