Semantic History:

Jie Bao, Li Ding, and Deborah L. McGuinnessTetherless World Constellation

Rensselaer Polytechnic InstituteTroy, NY, 12180-3590, USA

{baojie,dingl, dlm}@cs.rpi.edupdf & slides: http://tw.rpi.edu/wiki/TW-2009-17

Towards Modeling and PublishingChanges of Online Semantic Data

Semantic History:

Jie Bao, Li Ding, and Deborah L. McGuinnessTetherless World Constellation

Rensselaer Polytechnic InstituteTroy, NY, 12180-3590, USA

{baojie,dingl, dlm}@cs.rpi.edupdf & slides: http://tw.rpi.edu/wiki/TW-2009-17

WHAT Axel and Boris have done to the OWL Wiki and WHY Jim is now

called James

Outline

• Motivation• Architecture• Implementation• Examples• Future Work and Conclusions

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Motivation

4

Picture courtesy Matt Davies , Journal News, Jan 7, 2008

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MotivationBut finding and understanding changes could be a

nightmare…

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This becomes even trickier with “semantic wikis”

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Motivation

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Architecture

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Social Semantic WebSemantic History

revision of

author

…

…

Publish

REV1

REV2

Create

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What is “History”?

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Revision Action Temporal Data

• Where this change happened?• Who made it?• What content has been changed?• Why this action is taken?• Which source backs up the change?

• When the change happened?• How data (e.g., RDF triples) is changed?• How the temporal change is represented?

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Implementation on Semantic Mediawiki (SMW)

13Semantic MediaWiki

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SMW

The Semantic History (SH) extension captures edit actions

Revision history

User

User makes edits

Triple Representatio

n of history

Triplified revision history is added to and managed by the SMW

Applications use the triplified revision history for various purposes

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SH Templates(customizable

)

SH Templates generate semantic descriptions of revision history

{{SH_Triple |…}} {{SH_Add |…}}{{SH_Delete|…}}

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Data to TriplesExample: Revision

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{{SH_Rev|3353|20090714211611|User:Baojie|James Hendler}}

Rev:3353 id 3353

Rev:3353 time 20090714211611

Rev:3353 author User:Baojie

Rev:3353 about James Hendler

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Customizable!Customizable!

Customizable!Customizable!

Data to Triples Example: Editing Summary

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“SH_Summary”Template

{{SH_Summary|reason::Introduction

wordsmithing ;source::http://www.w3c….;category:Grammar Fixing; }}

Rev:3145 reason Introduction wordsmithing

Rev:3145 source http://www.w3c….

Rev:3145 rdf:type wiki:Grammar Fixing

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Customizable!Customizable!Customizable!Customizable!

Usage Examples

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Provenance tracking

Who has changed the first name of James Hendler? http://tw.rpi.edu/proj/semhis.wiki/index.php/Example_4 1810/25/2009 SDOW @ ISWC 2009

Query: Semantic Recent Change

http://tw.rpi.edu/proj/semhis.wiki/index.php/Semantic_recent_changes

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Statistics

Which domain has attracted more changes: University or Person?http://tw.rpi.edu/proj/semhis.wiki/index.php/Example_5 2010/25/2009 SDOW @ ISWC 2009

Temporal Reasoning

Which papers of Jie Bao are "Tetherelss World Publication"?http://tw.rpi.edu/proj/semhis.wiki/index.php/Example_8 2110/25/2009 SDOW @ ISWC 2009

Future Work – Integration with other tools

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Data.gov wiki – Government dataData.gov wiki – Government data

Wiki-basedOntology EditorWiki-basedOntology Editor

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http://tw.rpi.edu/proj/cnlhttp://tw.rpi.edu/proj/cnlhttp://data-gov.tw.rpi.edu/http://data-gov.tw.rpi.edu/

Future Work

• Scalability test/improvement– How fast it will be in coping a lot of changes?

• Trust computation– How semantics help evaluate trustworthiness of wiki

content?

• Advanced explanation– How to find the cause of a change on a semantic wiki?

• Wikipedia revisions as linked data– Open up a time machine for traveling Wikipedia.

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Conclusions

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Thanks!

• Email: baojie@cs.rpi.edu

• Demo: http://tw.rpi.edu/semhis

• Download:http://www.mediawiki.org/wiki/Extension:SemanticHistory

• pdf & slides: http://tw.rpi.edu/wiki/TW-2009-17

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Backup

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Related Work

• Temporal KR: in DB/OWL/RDF/SPARQL…– Our work is tied a particular KR formalism

• Change Detecting– We focus on publishing history as linkable data

• RDF diff– Complements of our work for detecting triple changes– Our work additionally addresses provenance and

rationale

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But how to find that without manually reading 200+ pages?

Which countries have outdated/missing 2008 GDP (nominal) figure on Wikipedia?

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Revision

{{SH_Rev|3353|20090714211611|User:Baojie|Jin Guang Zheng}}

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Template-based Triplification

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{{SH_Rev|3353|20090714211611|User:Baojie|Jin Guang Zheng}}

Template:SH_Rev

Instance of the template:

Revision [[id::{{{1}}}]], about [[about::{{{4|NA}}}]], on time [[time::{{{2}}}| ]] [[formatTime::{{DateFormat|{{{2}}}}}]], by author [[author::{{{3}}}]] [[Category:Revision]]{{#if: {{{5|}}}| [[Category:{{{5}}}]]}}

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Triple Changes

A typical triple page

{{SH_Triple|RPI|DefinedBy|Jie Bao}} {{SH_Add|1454|20090708190303|

User:Baojie}}{{SH_Add|M20090708235158|

20090708235158|User:Baojie}}{{SH_Delete|3305|

20090713115342|User:Baojie}}

{{SH_Obsolete|1}}

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Editing Summary

A revision page with semantic summary

{{SH_Rev|2462|20090712064807|User:Baojie|Main Page}}

{{SH_Summary|reason::to demo semantic summary; source::none; category:Test Edit; something not useful}}

{{SH_Minor}}

How to explain summary is up to the wiki admin (by designing “Template:SH_Summary”)32

Customizable grammar

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Explanation

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Created by

Uses template

Doesn’t generate “member_of” assertions

Generates “member_of” assertions

one possible explanation of

Why Jie Bao is a member of the project ITA?http://tw.rpi.edu/proj/semhis.wiki/index.php/Example_1110/25/2009 SDOW @ ISWC 2009