Download - 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 Page 2
http://lod2.eu
LOD2 in a Nutshell
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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
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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
Creating Knowledge out of Interlinked Data
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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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Creating Knowledge out of Interlinked Data
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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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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
Creating Knowledge out of Interlinked Data
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RDFauthor in OntoWiki
Creating Knowledge out of Interlinked Data
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RDFauthor on a RDFa annotated Website
Creating Knowledge out of Interlinked Data
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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?
Creating Knowledge out of Interlinked Data
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SCOVO – Statistical Core Vocabulary
Creating Knowledge out of Interlinked Data
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SCOVO Importer – Linked Statistical Data
Creating Knowledge out of Interlinked Data
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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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• 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
Creating Knowledge out of Interlinked Data
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EvoPat Architecture
Creating Knowledge out of Interlinked Data
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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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update and notification services for LOD Downward compatible with Pingback (blogosphere)http://aksw.org/Projects/SemanticPingBack
Creating a network effect forLinked Data: Semantic Pingback
Creating Knowledge out of Interlinked Data
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Visualizing Pingbacks in OntoWiki
Creating Knowledge out of Interlinked Data
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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?
Creating Knowledge out of Interlinked Data
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Mobile OntoWiki
Creating Knowledge out of Interlinked Data
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Mobile OntoWiki
Creating Knowledge out of Interlinked Data
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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?
Creating Knowledge out of Interlinked Data
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Catalogus Professorum Lipsiensis
The CPL Model
Creating Knowledge out of Interlinked Data
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CPL Authoring Activity
Creating Knowledge out of Interlinked Data
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Visual Query Builder
Creating Knowledge out of Interlinked Data
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Relationship Finder in CPL
Creating Knowledge out of Interlinked Data
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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
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• 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?
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Thanks for your attention!
Sören Auerhttp://aksw.org | http://[email protected]