Principles- 1

1
CmpE 583- Web Semantics Theory and
PracticePRINCIPLES

• Atilla ELÇI
• Computer Engineering Department
• Eastern Mediterranean University

2
Introduction

• An understanding of underlying principles helps
  towards learning semantic Web.
• Consideration of present day applications sets
  examples and gives sense of limits of the
  semantic Web technology.
• Of those, URI and XML have very prominent roles
  in the success of semantic Web.
• Understanding the subject is eased through a
  proper model mimicking the mechanics of
  interaction and hierarchy of components in
  effecting semantic Web.

3
Agenda

• Semantic Web principles
• Semantic Web practices
• Components
• URI naming
• XML technologies

4
Semantic Web Principles

• TBL TBL-2002 Primitive Qualities
• Device independence
• Software Independence
• Internationalization
• Multimedia
• Accessibility
• Rhyme and reason
• Quality
• Independence of Scale.
• An Overview of The Semantic Web, by Eric Miller.
• Introducing the Semantic Web, by Dan Brickley.

5
Semantic Web Practices

• Examples from
• Business issues and deployment examples in
  Introducing the Semantic Web, by Dan Brickley.
• Advanced development in An Overview of The
  Semantic Web, by Eric Miller.
• Deployment examples in Semantic Web, Phase 2
  Developments and Deployment, by Eric Miller.
• Some early applications of Semantic Web by AIFB.

6
Semantic Web Components

• TBL SW Pieces from 50K doc.
• The Big Picture missing.
• The Semantic Web A Primer by Edd Dumbill.

7
Semantic Web- Layers of AbstractionMachine-Unders
tandable Information Ref. TBL-98 ( Slide form
Intro, p.8)

• The basic assertion model layer Resource
  Description Framework
• RDF for Assertions and quotations.
• The schema layer RDF Schema for forms
  compliance.
• Conversion language for doc conversion from one
  RDF schema to another.
• The logical layer expressing rules of
  processing.
• Language for proof proof validation
• Inference rules language
• Query languages
• Digital signature
• Engines of the future.

8
Semantic Web Components (continues)

• Eric Dumbills Model click-a-ref
• (Circa 2000?)

Redland
XML Protocols
Redfoot
xHTML
Wraf
SOAP
APPLICATION PLATFORMS
XSLT
RDF, RDF SCHEMAS, ONTOLOGIES
XML
URI
9
Semantic Web Components (continues)The Big
Picture

• Still missing!

10
Semantic Web Components (continues)Ref.
Schwartz SW in Beardth.

• Layers, bottom to top
• URI
• XML
• XML Namespaces
• RDF
• RDF Schemas
• WebOnt
• Logic
• Proof

Semantic Web Bus by TBL
11
Semantic Web Components (continues)Ref.
Schwartz SW for Developers.
The end-to-end big picture The Semantic Web An
Introduction by Aaron Swartz.

• Layers, bottom to top
• URI
• HTTP
• RDF
• Semantic Web Services
• Aggregation
• Security
• Logic
• Proof

12
URI Naming

• URI- Uniform Resource Identifier (URI aka URL)
  are short strings that identify resources in the
  web
• The URI specification effectively defines a
  space, that is a mapping between identifiers
  (URIs) and resources.
• Uniform Resource Identifiers (URI) Generic
  Syntax (RFC2396)
• URL- Uniform Resource Locator is a Web address.
• URL anatomy breaking it down.
• The Official IANA Registry of URI Schemes.
• The Official IANA Registry of URN Namespaces.
• The living official Internet
• The IANA Matrix Protocol Number Assignment
  Services.

13
XML Technologies

• XML- Extensible Markup Language is a simple, very
  flexible text format derived from SGML (ISO
  8879).
• More next chapter.

14
Where to Get More Information

• TBL-2002 Tim Berners-Lee The World Wide Web -
  Past Present and Future,  Commemorative Lecture
  2002 Japan Prize,2002-04.
• Eric Miller Semantic Web, Phase 2 Developments
  and Deployment, presented at WWW2004 W3C Track on
  the Semantic Web, 2004-05-20. W3C-2004
• Semantic Web WWW Consortium Semantic Web pages,
  2004.
• Schwartz Aaron Schwartz The Semantic Web in
  Breadth. http//logicerror.com/semanticWeb-long.
• Schwartz Aaron Schwartz The Semantic Web for
  Developers. http//logicerror.com/semanticWeb-webd
  ev.