eXtended Knowledge Organization System (XKOS)

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eXtended Knowledge Organization System (XKOS)

• Prepared byFranck Cotton, Institut National de
  la Statistique et des Études ÉconomiquesDaniel
  W. Gillman, US Bureau of Labor StatisticsYves
  Jaques, Food and Agriculture Organization of the
  United Nations

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Why XKOS?

• Increasing trend (and pressure) for greater
  accessibility to public data.
• Linked Open Data (LOD) among the favored
  approaches (see data.gov.uk).
• but
• No existing LOD standards with which to correctly
  model classifications.
• XKOS grew from the work on DDI-RDF during several
  workshops at Dagstuhl organized by GESIS.

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What is LOD?
Tim Berners-Lee

• In 2006 Tim Berners-Lee outlined four principles
  of Linked Data
• Use URIs to identify things
• Use HTTP URIs so that these things can be
  referred to and looked up (dereferenced) by
  people and user agents
• Provide useful information about the thing when
  its URI is dereferenced, using standard formats
  such as RDF/XML
• Include links to other, related URIs in the
  exposed data to improve discovery of other
  related information on the Web

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What is RDF?

• A standard knowledge model for making statements
  about resources based on a few elegant ideas
• Everything has a URI.
• Knowledge is a series of Subject-Verb-Object
  statements (triples)

http//xmlns.com/foaf/0.1/Person
http//www.example.org/joe/
http//www.w3.org/1999/02/22-rdf-syntax-nstype
http//xmlns.com/foaf/0.1/homepage
http//www.example.org/joe/contact.rdfjoesmith
http//xmlns.com/foaf/0.1/family_name
http//xmlns.com/foaf/0.1/mbox
http//xmlns.com/foaf/0.1/givenname
mailtojoe.smith_at_example.org
Joe
Smith
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What is SKOS?
Simple Knowledge Organization System

• Provides a model for expressing the basic
  structure and content of concept schemes such as
• thesauri,
• classification schemes,
• subject heading lists,
• taxonomies,
• folksonomies,
• and other similar types of controlled vocabulary.

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What does SKOS look like?
Concept 6211 Products
skosbroader
skosnarrower
Concept 8171 Plant Products
skosbroader
skosnarrower
Concept 1474 Cereals
Maize_at_en
skosprefLabel
skosbroader
skosnarrower
Concept 12332 Maize
Kukorica _at_hu
skosprefLabel
Concept 12332 Zea mays
skosprefLabel
skosrelated
Misir_at_tr
skosaltLabel
skosnotation
Corn_at_en
12332 ltAgrovocCodegt
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What is XKOS?
eXtended Knowledge Organization System
An eXtension of SKOS
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New classes, refined properties
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Demo
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Next steps

• Review the proposal
• Get feedback from the community
• Begin W3C submittal process
• Publicize
• Implement

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Thanks.