Semantic Web Advanced Development

8 May 2002
WWW2002
Honolulu, Hawaii, USA

http://www.w3.org/2002/Talks/0508-swad/

Ralph Swick, Dan Brickley

SWAD Objectives

• Demonstrate the feasibility and utility of Semantic Web concepts
• Develop components that can form the basis for widely-deployed Semantic Web infrastructure
• Explore leading edge issues necessary for Semantic Web but not ready for standardization

SWAD-MIT

Semantic Web Advanced Development/MIT

• Funded by DARPA Agent Markup Language Program
• Additional funds and resources provided by Hewlett-Packard and Elisa Communications
• Development and Industry Deployment
• Semantic Web Logic Language
• Semantic Web support for Cooperative Work
  • Annotations & Cataloging
  • Meeting facilitation
  • Work process tracking

SWAD-MIT Current Work

• cwm, RDF logic processor and RDF/N3-RDF/XML syntax translator
• generic RDF Database and query framework
• RDF Validation Service
• collaborative descriptive and annotation capabilities in Amaya
• Blindfold grammar-based RDF graph extractor/transformation toolkit
• RDF Schema Navigation registration and navigation of RDF vocabularies
• W3C At a Glance syndication & aggregation service
• Zakim meeting facilitation

CWM - RDF logic processor

@prefix log: <http://www.w3.org/2000/10/swap/log#> .
@prefix daml: <http://www.daml.org/2001/03/daml+oil#> .
@prefix : <#> .

this log:forAll <#p> .

{  <#p> a daml:TransitiveProperty . }

 log:implies

{
    { <#a> <#p> <#b>.
      <#b> <#p> <#c>. }

  log:implies

    { <#a> <#p> <#c>. }.
  this log:forAll <#a> , <#b> , <#c>.
} .


<#ancestor> a daml:TransitiveProperty .
<#billy> <#ancestor> <#pa> .
<#pa> <#ancestor> <#grandpa> .

Algae - logic-enabled query processor

(ask '(
  (http://...#ancestor ?person ?ancestor)
):collect '(?person ?ancestor)) 

returns all statements (triples) in the database where http://...#ancestor is the predicate;

from the previous example, returns both billy and pa statements.

(ask '(
  (http://...#ancestor http://...#billy ?ancestor)
):collect '(?ancestor)) 

returns only 'pa'.

(namespace '(g http://.../genealogy#)
 fwrule (head '((g::ancestor ?a ?b)
                (g::ancestor ?b ?c))
         body '((g::ancestor ?a ?c)))

 ask '(
  (http://...#ancestor http://...#billy ?ancestor)
):collect '(?ancestor))

returns both 'pa' and 'grandpa'.

RDF Validation Service

• Currently: a syntax validator, based on HP-Labs ARP parser
• Uses AT&T Labs GraphViz to produce visualization
• Solicit a volunteer to integrate with a schema validation based on cwm

Annotea

• Collaborative annotation service
• Integrated with Amaya editor/browser
• Extending to collaborative descriptions/cataloging

Zakim Meeting Agent

• Designed for W3C teleconference work style
• Integrates real-time teleconference participation data
  • callerID data; roll-call
  • floor control (requests to speak)
  • agenda tracking
• Use case & platform for work on privacy information specifiers

SWAD-Europe

Semantic Web Advanced Development/Europe

• Funded under IST-7; started May 1
• Partnership between ILRT/University of Bristol, HP, W3C/INRIA, RAL/CCLRC, Stilo
• Integration of Semantic Web with other XML technology and Web Services
• Dissemination and exploitation (education and outreach)
• Visualization and Accessibility
• Distributed trust systems
• Annotations Demonstrator

SWAD-Europe Goals

• Implement scenario-led examples showing the integration of multiple Semantic Web technologies drawing practical use cases from industry, consumer, developer perspectives.
• Put emphasis on the utility of XML languages (such as SVG, HTML, MathML, XLink) as complementary rather than competing components of the Semantic Web.
• Ensure that the European developers, citizens and content creators are kept aware of Semantic Web technology for supporting universal accessibility, device independence and internationalisation.
• Ensure that European Community is kept aware of international best practice, and that best practice within Europe is recognised internationally.
• Undertake targeted research and development in support of these objectives, and in collaboration with the wider European developer community, W3C Member organisations, and related Open Source initiatives.

SWAD-Europe Education&Outreach

Education will be lead by scenarios.

Example:

User/developer wants a standards-based way of publishing his organizational chart.

Does he:

• Use XML Schema and create MYORG.xsd?
• Use SVG?
• Use RDF, RDF Schema, OWL?