Linked data and semantic wikis

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This presentation gives a brief overview on achievements and challenges of the Data Web and describes different aspects of using the Semantic Data Wiki OntoWiki for Linked Data management.

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Linked data and semantic wikis

  1. 1. Semantic Wikis and the Web of Data Sören Auer
  2. 2. 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 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 Partners Uni Leipzig, DERI Galway, FU Berlin, Semantic Web Company, OpenLink, Tenforce, Exalead, Wolters Kluwer, OKFN
  3. 3. Creating Knowledge out of Interlinked Data Semantic Wikis and the Web of Data 02.09.2010 Page 3 http://lod2.eu 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 Personalization o individual mashups of data with other sources o Notification/subscription service based on personal prefs o Transparency wishlists, upload revisions, derivates o create and publish queries, reports and visualizations 3 Dataset Usage Data Provider Eurostat Public 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
  4. 4. Creating Knowledge out of Interlinked Data Semantic Wikis and the Web of Data 02.09.2010 Page 4 http://lod2.eu Achievements 1. 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  Challenges 1. Coherence: Relatively few, expensively maintained links 2. Quality: partly low quality data and inconsistencies 3. 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
  5. 5. Creating Knowledge out of Interlinked Data Semantic Wikis and the Web of Data 02.09.2010 Page 5 http://lod2.eu Make the Web a Linked Data Washing Machine Inter- linking Fusing Classifi- cation Enrich- ment Repair Manual revision/ authoring
  6. 6. Creating Knowledge out of Interlinked Data Semantic Wikis and the Web of Data 02.09.2010 Page 6 http://lod2.eu Supporting the Linked Data Lifecycle with a Semantic Data Wiki: 1. OntoWiki – Semantic Data Wiki 2. RDFauthor – Authoring RDF content 3. SCOVO-Importer – Importing and Representing statistical data in RDF 4. EvoPat – Pattern based KB Evolution 5. Semantic Pingback – Creating a network effect around Linked Data 6. Mobile OntoWiki 7. Use Case: Catalogus Professorum Linked Data & Semantic Wikis – a winning team?
  7. 7. Creating Knowledge out of Interlinked Data Semantic Wikis and the Web of Data 02.09.2010 Page 7 http://lod2.eu 1. Semantic (Text) Wikis • Authoring of semantically annotated texts 2. Semantic Data Wikis • Direct authoring of structured information (i.e. RDF, RDF-Schema, OWL) Two Kinds of Semantic Wikis
  8. 8. Creating Knowledge out of Interlinked Data Semantic Wikis and the Web of Data 02.09.2010 Page 8 http://lod2.eu 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
  9. 9. Creating Knowledge out of Interlinked Data Semantic Wikis and the Web of Data 02.09.2010 Page 9 http://lod2.eu 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
  10. 10. Creating Knowledge out of Interlinked Data Semantic Wikis and the Web of Data 02.09.2010 Page 11 http://lod2.eu
  11. 11. Creating Knowledge out of Interlinked Data Semantic Wikis and the Web of Data 02.09.2010 Page 12 http://lod2.eu Supporting the Linked Data Lifecycle with a Semantic Data Wiki: 1. OntoWiki – Semantic Data Wiki 2. RDFauthor – Authoring RDF content 3. SCOVO-Importer – Importing and Representing statistical data in RDF 4. EvoPat – Pattern based KB Evolution 5. Semantic Pingback – Creating a network effect around Linked Data 6. Mobile OntoWiki 7. Use Case: Catalogus Professorum Linked Data & Semantic Wikis – a winning team?
  12. 12. Creating Knowledge out of Interlinked Data Semantic Wikis and the Web of Data 02.09.2010 Page 13 http://lod2.eu 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
  13. 13. Creating Knowledge out of Interlinked Data Semantic Wikis and the Web of Data 02.09.2010 Page 14 http://lod2.eu • 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
  14. 14. Creating Knowledge out of Interlinked Data Semantic Wikis and the Web of Data 02.09.2010 Page 15 http://lod2.eu RDFauthor process
  15. 15. Creating Knowledge out of Interlinked Data Semantic Wikis and the Web of Data 02.09.2010 Page 16 http://lod2.eu RDFauthor in OntoWiki
  16. 16. Creating Knowledge out of Interlinked Data Semantic Wikis and the Web of Data 02.09.2010 Page 17 http://lod2.eu RDFauthor on a RDFa annotated Website
  17. 17. Creating Knowledge out of Interlinked Data Semantic Wikis and the Web of Data 02.09.2010 Page 18 http://lod2.eu Supporting the Linked Data Lifecycle with a Semantic Data Wiki: 1. OntoWiki – Semantic Data Wiki 2. RDFauthor – Authoring RDF content 3. SCOVO-Importer – Importing and Representing statistical data in RDF 4. EvoPat – Pattern based KB Evolution 5. Semantic Pingback – Creating a network effect around Linked Data 6. Mobile OntoWiki 7. Use Case: Catalogus Professorum Linked Data & Semantic Wikis – a winning team?
  18. 18. Creating Knowledge out of Interlinked Data Semantic Wikis and the Web of Data 02.09.2010 Page 19 http://lod2.eu SCOVO – Statistical Core Vocabulary
  19. 19. Creating Knowledge out of Interlinked Data Semantic Wikis and the Web of Data 02.09.2010 Page 20 http://lod2.eu SCOVO Importer – Linked Statistical Data
  20. 20. Creating Knowledge out of Interlinked Data Semantic Wikis and the Web of Data 02.09.2010 Page 21 http://lod2.eu Supporting the Linked Data Lifecycle with a Semantic Data Wiki: 1. OntoWiki – Semantic Data Wiki 2. RDFauthor – Authoring RDF content 3. SCOVO-Importer – Importing and Representing statistical data in RDF 4. EvoPat – Pattern based KB Evolution 5. Semantic Pingback – Creating a network effect around Linked Data 6. Mobile OntoWiki 7. Use Case: Catalogus Professorum Linked Data & Semantic Wikis – a winning team?
  21. 21. Creating Knowledge out of Interlinked Data Semantic Wikis and the Web of Data 02.09.2010 Page 22 http://lod2.eu • 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
  22. 22. Creating Knowledge out of Interlinked Data Semantic Wikis and the Web of Data 02.09.2010 Page 23 http://lod2.eu Evolution Patterns
  23. 23. Creating Knowledge out of Interlinked Data Semantic Wikis and the Web of Data 02.09.2010 Page 25 http://lod2.eu EvoPat Architecture
  24. 24. Creating Knowledge out of Interlinked Data Semantic Wikis and the Web of Data 02.09.2010 Page 26 http://lod2.eu Supporting the Linked Data Lifecycle with a Semantic Data Wiki: 1. OntoWiki – Semantic Data Wiki 2. RDFauthor – Authoring RDF content 3. SCOVO-Importer – Importing and Representing statistical data in RDF 4. EvoPat – Pattern based KB Evolution 5. Semantic Pingback – Creating a network effect around Linked Data 6. Mobile OntoWiki 7. Use Case: Catalogus Professorum Linked Data & Semantic Wikis – a winning team?
  25. 25. Creating Knowledge out of Interlinked Data Semantic Wikis and the Web of Data 02.09.2010 Page 27 http://lod2.eu update and notification services for LOD Downward compatible with Pingback (blogosphere) http://aksw.org/Projects/SemanticPingBack Creating a network effect for Linked Data: Semantic Pingback
  26. 26. Creating Knowledge out of Interlinked Data Semantic Wikis and the Web of Data 02.09.2010 Page 28 http://lod2.eu Visualizing Pingbacks in OntoWiki
  27. 27. Creating Knowledge out of Interlinked Data Semantic Wikis and the Web of Data 02.09.2010 Page 29 http://lod2.eu Supporting the Linked Data Lifecycle with a Semantic Data Wiki: 1. OntoWiki – Semantic Data Wiki 2. RDFauthor – Authoring RDF content 3. SCOVO-Importer – Importing and Representing statistical data in RDF 4. EvoPat – Pattern based KB Evolution 5. Semantic Pingback – Creating a network effect around Linked Data 6. Mobile OntoWiki 7. Use Case: Catalogus Professorum Linked Data & Semantic Wikis – a winning team?
  28. 28. Creating Knowledge out of Interlinked Data Semantic Wikis and the Web of Data 02.09.2010 Page 30 http://lod2.eu Mobile OntoWiki
  29. 29. Creating Knowledge out of Interlinked Data Semantic Wikis and the Web of Data 02.09.2010 Page 31 http://lod2.eu Mobile OntoWiki
  30. 30. Creating Knowledge out of Interlinked Data Semantic Wikis and the Web of Data 02.09.2010 Page 32 http://lod2.eu Supporting the Linked Data Lifecycle with a Semantic Data Wiki: 1. OntoWiki – Semantic Data Wiki 2. RDFauthor – Authoring RDF content 3. SCOVO-Importer – Importing and Representing statistical data in RDF 4. EvoPat – Pattern based KB Evolution 5. Semantic Pingback – Creating a network effect around Linked Data 6. Mobile OntoWiki 7. Use Case: Catalogus Professorum Linked Data & Semantic Wikis – a winning team?
  31. 31. Creating Knowledge out of Interlinked Data Semantic Wikis and the Web of Data 02.09.2010 Page 33 http://lod2.eu Catalogus Professorum Lipsiensis
  32. 32. The CPL Model
  33. 33. Creating Knowledge out of Interlinked Data Semantic Wikis and the Web of Data 02.09.2010 Page 37 http://lod2.eu CPL Authoring Activity
  34. 34. Creating Knowledge out of Interlinked Data Semantic Wikis and the Web of Data 02.09.2010 Page 38 http://lod2.eu Visual Query Builder
  35. 35. Creating Knowledge out of Interlinked Data Semantic Wikis and the Web of Data 02.09.2010 Page 39 http://lod2.eu Relationship Finder in CPL
  36. 36. Creating Knowledge out of Interlinked Data Semantic Wikis and the Web of Data 02.09.2010 Page 40 http://lod2.eu 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
  37. 37. Creating Knowledge out of Interlinked Data Semantic Wikis and the Web of Data 02.09.2010 Page 41 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 and Scientific Data • From eat-your-own-dogfood to convince-you-grandma What should we do in the future?
  38. 38. Creating Knowledge out of Interlinked Data Semantic Wikis and the Web of Data 02.09.2010 Page 42 http://lod2.eu Thanks for your attention! Sören Auer http://aksw.org | http://lod2.org auer@uni-leipzig.de

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