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Towards Automatic Content Quality Checks in Semantic Wikis

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[Capital::Washington, DC]] Allows to query wiki. Biggest Californian ... Extra page for each disjointness axiom! Each axiom has to be named (no obvious name) ... – PowerPoint PPT presentation

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Title: Towards Automatic Content Quality Checks in Semantic Wikis


1
Towards Automatic Content Quality Checks in
Semantic Wikis

Denny Vrandecic KIT Karlsruhe Institute of
Technology Institut AIFB AAAI Spring
Symposium Stanford University 23 March 2009
2
Overview
  • Semantic MediaWiki
  • Multilanguage checks
  • Automatic content checks
  • Social and usability aspects
  • Outlook

2
3
Semantic MediaWiki
  • CategoryCountry
  • CapitalWashington, DC
  • Allows to query wiki
  • Biggest Californian cities with a female mayor
  • Export data as RDF
  • Wikipedia as a knowledge base for external apps
  • Collaborative, formal knowledge construction

3
4
Multilanguage checks
en
hr
de
Austrija
Austria
Österreich
Glavni grad
Rome
Rim
Rom
Capital
Hauptstadt
Bec
Wien
Vienna
4
5
Concepts in SMW
  • Like Category, but intensional not extensional
  • Saved queries
  • ConceptUS state
  • CategoryState
  • part ofUSA
  • Basically EL for concept description
  • Exported as OWL

5
6
Automatic content check Concept cardinality
  • On ConceptUS state add cardinality50
  • Also max and min cardinality?
  • Stating disjointness of A and B by having
    cardinality0 on a concept page that is the
    intersection of A and B
  • ConceptUS-German state
  • ConceptUS state
  • ConceptGerman state
  • Extra page for each disjointness axiom!
  • Each axiom has to be named (no obvious name)

6
7
Automatic content check Domain and range
  • On PropertyCapital add domainState and
    rangeCity
  • Domain and ranges are used as constraints

7
8
Automatic content check Property cardinality
  • On PropertyCapital add cardinality1
  • Constraints apply only to pages that actually use
    the property
  • Constraints not for a specific class (does this
    make sense?)
  • Cannot say Each state must have at least one
    capital
  • Would require use of n-aries

8
9
Notes on semantics
  • Checks are not OWL semantics
  • No Open World Assumption
  • Missing entities will not be inferred
  • Closer to autoepistemic logics
  • Properties and ranges as constraints
  • Missing categorization will not be inferred
  • No interplay of checks with other semantics
  • No inferences at all from checks
  • Careful with exporting in OWL

9
10
Social and usability aspects
  • Obvious information location
  • Not several ways to state the same thing
  • Obvious place of discussion
  • How to handle inconsistencies?
  • Disallow edits that would introduce
    inconsistencies?
  • Allow them and add a warning on the page?
  • Have special pages to easily find them?

10
11
Outlook
  • Implementation
  • Get feedback
  • Learn constraints and checks automatically?
  • More powerful integrity constraints?
  • The population of a country must not be smaller
    than the sum of the population of the cities of
    the country.
  • If X is a teacher of Y, X must not have died
    before Y was born.
  • Usability and social aspects!

11
12
Thank you for your attention!
Questions?
  • Denny Vrandecic
  • denny_at_aifb.uka.de

12
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