linked data and semantic wikis

Semantic Wikis and the Web of Data

Sören Auer

Creating Knowledge out of Interlinked Data

Semantic Wikis and the Web of Data 02.09.2010

http://lod2.eu

LOD2 in a Nutshell

2

Research focus• Very large RDF data

management• Enrichment &

Interlinking• Fusion & Information

Quality• Adaptive UI interfaces

Use Cases• Media & Publishing• Enterprise Data Webs• Open Gov Data

PartnersUni Leipzig, DERI Galway,

FU Berlin, Semantic Web Company, OpenLink, Tenforce, Exalead, Wolters Kluwer, OKFN



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Open Governmental Data –and ideal testbed for Linked Data?

Close cooperation with W3C eGov IG, OKFN’s OpenEUdata, PSI & grassroots efforts

CKAN.org | OKFN’s EuOpenData group |ICT2010 Networking Session

UIs and Personalizationo individual mashups of data with other sourceso Notification/subscription service based on personal prefso Transparency wishlists, upload revisions, derivateso create and publish queries, reports and visualizations

3

Dataset Usage Data ProviderEurostatPublic Opinion Interlink with DBpedia and UK eGov data Statistical Office

DG Communication

CORDIS Interlinked with projects, publications and researchers Publication Office

Job Mobility Portal / European Career Interlinked with UK eGov data EURES, EPSO

TED – Tenders electronic Daily Interlink with national company registries Publication Office

National datasets Road traffic usage, edubase, national statistics Data.gov.uk

… … …

European registry & collaboration platform for open governmental data Outreach & involve original data providers - local, regional, national and European



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Achievements1. Extension of the Web with

a data commons (13.1 B facts

2. vibrant, global RTD community

3. Industrial uptake begins (e.g. BBC, Thomson Reuters, Eli Lilly)

4. Emerging governmental adoption in sight

5. Establishing Linked Data as a deployment path for the Semantic Web.

LOD achievements and challenges

Challenges1. Coherence: Relatively few,

expensively maintained links2. Quality: partly low quality data

and inconsistencies3. Performance: Still substantial

penalties compared to relational 4. Data consumption: large-scale

processing, schema mapping and data fusion still in its infancy

5. Usability: Missing direct end-user tools and network effect

These issues are closely related and need to be treated in an integrated, holistic fashion – LOD2 ;-)

• Web - a global, distributed platform for data, information and knowledge integration• exposing, sharing, and connecting pieces of data, information, and knowledge on the Semantic Web

using URIs and RDF

July 2007 April 2008 September 2008

July 2009



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Make the Web a Linked Data Washing Machine

Inter-linking

Fusing

Classifi-cation

Enrich-ment

Repair

Manual revision/ authoring



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Supporting the Linked Data Lifecycle with a Semantic Data Wiki:

1. OntoWiki – Semantic Data Wiki2. RDFauthor – Authoring RDF content3. SCOVO-Importer – Importing and Representing

statistical data in RDF4. EvoPat – Pattern based KB Evolution5. Semantic Pingback – Creating a network effect

around Linked Data6. Mobile OntoWiki7. Use Case: Catalogus Professorum

Linked Data & Semantic Wikis – a winning team?



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1. Semantic (Text) Wikis• Authoring of

semanticallyannotated texts

2. Semantic Data Wikis• Direct authoring of

structured information (i.e. RDF, RDF-Schema, OWL)

Two Kinds of Semantic Wikis



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Semantic Wikis

OntoWiki Semantic MediaWiki KiWi( IkeWiki)

Main developer Uni Leipzig AKSW AIFB Karlsruhe Salzburg Research

Technology PHP/MySQL PHP/MySQL (MediaWiki extension)

Java/Postgres

Base artifacts Facts (annotated) texts (annotated) texts

Authoring WYSIWIG facts / forms

Wiki syntax / semantic forms

WYSIWIG / forms

Other Data Web development framework

Planned Wikipedia deployment

Visual KB browser



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Wiki: simplest „database“ that could possibly work

Leitmotif: ``make it easy to correct mistakes, rather than make it hard to make them''

Ward Cunningham‘s original Wiki design principles:

OntoWiki‘s Aim: simplest knowledge base that could possibly work

The (Semantic) Wiki Way

Precise

OpenIncremental Organic Uniform

MundaneObservable Convergent Overt

Universal



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Most RDF and ontology editors provide forms for authoring structured information

•users don’t have to deal with syntax • Still they have to be acquainted with

the RDF or ontology data models

RDFauthor aims to hide syntax and data model by making RDFa views editable

RDFauthor – empower end users to author RDF



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• RDFa annotated Web page (+ SPARUL endpoint)• Integrated RDFauthor JavaScript library• Authoring is triggered by connecting events (i.e.

click of an edit button) with RDFauthor functions

RDFauthor Ingredients



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RDFauthor process



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RDFauthor in OntoWiki



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RDFauthor on a RDFa annotated Website



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1. OntoWiki – Semantic Data Wiki2. RDFauthor – Authoring RDF content3. SCOVO-Importer – Importing and

Representing statistical data in RDF4. EvoPat – Pattern based KB Evolution5. Semantic Pingback – Creating a network effect





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SCOVO – Statistical Core Vocabulary



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SCOVO Importer – Linked Statistical Data



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• unified method, for both data evolution and ontology refactoring.

• modularized, declarative definition of evolution patterns is relatively simple compared to an imperative description of evolution• allows domain experts and knowledge engineers to amend the

ontology structure and modify data with just a few clicks• Combined with RDF representation of evolution patterns and

their exposure on the Linked Data Web, EvoPat facilitates the development of an evolution pattern ecosystem• patterns can be shared and reused on the Data Web.

• declarative definition of bad smells and corresponding evolution patterns promotes the (semi-)automatic improvement of information quality.

EvoPat – Pattern based KB Evolution



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Evolution Patterns



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EvoPat Architecture



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statistical data in RDF4. EvoPat – Pattern based KB Evolution5. Semantic Pingback – Creating a network

effect around Linked Data6. Mobile OntoWiki7. Use Case: Catalogus Professorum




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update and notification services for LOD Downward compatible with Pingback (blogosphere)http://aksw.org/Projects/SemanticPingBack

Creating a network effect forLinked Data: Semantic Pingback



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Visualizing Pingbacks in OntoWiki



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Mobile OntoWiki



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Catalogus Professorum Lipsiensis

The CPL Model



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CPL Authoring Activity



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Visual Query Builder



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Relationship Finder in CPL



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Take home messages

• Two kinds of Semantic Wikis: Data and Text oriented ones

• Semantic Wikis lower the entrance barrier to publishing and interlinking LOD data

• Different LOD aspects such as knowledge base evolution, coherence (pingback), data importing, browsing & exploration can be facilitated by a Semantic Wiki



http://lod2.eu

• Establish a network effect around LOD• Create the LOD washing machine

(possibly with Semantic Wiki’s as an engine)• Target Enterprise Information Integration,

Open Governmental andScientific Data • From eat-your-own-dogfood to

convince-you-grandma

What should we do in the future?



http://lod2.eu

Thanks for your attention!

Sören Auerhttp://aksw.org | http://[email protected]

http://aksw.org/

http://lod2.org/

linked data and semantic wikis

Technology

data fusion

statistical data

data consumption

data commons

pieces of data

ontowiki semantic data

linked data lifecycle

low quality data