Jakob Voss : Knowledge Organization with Wikipedia. 5th NKOS Workshop, Sep 21,2006

Knowledge Organizationwith Wikipedia –

Joining the Free Encyclopaedia and Digital Libraries

Jakob VossWikimedia Deutschland e.V. /

Common Library Network (GBV)

5th NKOS Workshop, AlicanteSeptember 21, 2006

CC-SA-2.5

Jakob Voss : Knowledge Organization with Wikipedia. 5th NKOS Workshop, Sep 21,2006

[[Outline]]

* Wikipedia

* Wikipedia's Category system

* Mapping

* Indexing with Wikipedia articles

* Summary

* Learn from Wikipedia

Jakob Voss : Knowledge Organization with Wikipedia. 5th NKOS Workshop, Sep 21,2006

[[What Wikipedia is]]

* Collaborative edited

* Free Content

* Encyclopaedias

* ~5 million articles, >50.000 editors

* 230 languages (~50 with > 10.000)

* Non-commercial, no ads

* TOP 16 website by access

Jakob Voss : Knowledge Organization with Wikipedia. 5th NKOS Workshop, Sep 21,2006

[[How Wikipedia is created]]

1) Find something to improve

2) Do it right

3) Let other people improve it

Jakob Voss : Knowledge Organization with Wikipedia. 5th NKOS Workshop, Sep 21,2006

[[Wikipedia categories]]

* Tagging by linking[[Categorie:Information Science]][[Category:Belgion Inventor]]...

* Open for all

* Blind tagging

* No aggregation (set-model)

* Multi-hierarchical relations

* High connectivity

Example: http://en.wikipedia.org/wiki/Paul_Otlet

Jakob Voss : Knowledge Organization with Wikipedia. 5th NKOS Workshop, Sep 21,2006

[[Wikipedia categories]]

Jakob Voss : Knowledge Organization with Wikipedia. 5th NKOS Workshop, Sep 21,2006

[[Category system as KOS]]

Collaboratively edited, general thesaurus(en, Jan 2006: 91,502 categories, 923,196 articles)

Distribution of descriptor levels

0.0%

5.0%

10.0%

15.0%

20.0%

25.0%

30.0%

35.0%

1 2 3 4 5 6 7 8 9 10 11 12

level

de

sc

rip

tors

DDC (ext.)

Wikipedia (en)

Voss (2006): Collaborative thesaurus tagging the Wikipedia wayhttp://arxiv.org/abs/cs.IR/0604036

Distribution of descriptors per record

0%

1%

10%

100%

1 2 3 4 5 6 7 8 9

descriptors (categories or tags)

reco

rds

(pag

es o

r p

ost

s)

Wikipedia

del.icio.us

exponential (λ=0.6)

Jakob Voss : Knowledge Organization with Wikipedia. 5th NKOS Workshop, Sep 21,2006

[[Mapping categories]]

* Articles linked via interlanguage links[[en:Paul_Otlet]], [[en:Paul_Otlet]]…

* Categories linked via interlanguage links

* Inter-Wiki mapping with cooccurences http://tools.wikimedia.de/~voj/cgi-bin/cocat?wikilang=en&wikifam=.wikipedia.org&cat=Information_science

Jakob Voss : Knowledge Organization with Wikipedia. 5th NKOS Workshop, Sep 21,2006

[[Mapping categories and KOS]]

* Manually add links to other KOS

* [[Kategorie:Informetrie]] <->JITA class BB bibliometric methodshttp://de.wikipedia.org/wiki/Kategorie:Informetrie

* Not very visible

* Difficult to judge

Jakob Voss : Knowledge Organization with Wikipedia. 5th NKOS Workshop, Sep 21,2006

[[Mapping articles and KOS]]

* Links to authority file PND(German National Library)

{{PND|119510928}}

* De, Aug 2006:>100.000 biographies~ 20% with PND

* Plans with GKD(corporate bodies)

* 1:1, 1:n, n:m

PND

Library

Museum

...

Wikipedia

article

Jakob Voss : Knowledge Organization with Wikipedia. 5th NKOS Workshop, Sep 21,2006

[[Indexing and the Semantic Web]]

* Redirects & Disambiguation=> Controlled vocabulary

* Stable referable concepts for indexing (indentity and reference in SW)

* Proposed by Bunescu & Pasça (2006), Fernandéz-García et al (2005), Hepp et al (2006), Krizhanovsky (2006),: Synonym search in Wikipedia: Synarcher, Lüer (2006), Voss (2006)…

* Solution: Published Subject IdentifiersPepper (2006)

* Changes and stable version URI/URL

Jakob Voss : Knowledge Organization with Wikipedia. 5th NKOS Workshop, Sep 21,2006

[[Semantic Wikipedia]]

Typed links: [[is capital of::England]]=> RDF triples

Völkel et al (2006): Semantic Wikipedia. WWW2006 conference

Jakob Voss : Knowledge Organization with Wikipedia. 5th NKOS Workshop, Sep 21,2006

[[Join Wikipedia and KOS]]

KOSKOSWikipedi

aContent

Wikipedia

KOS Wikipedia

Portal, Meta-KOS…

Enrichment

Wikipedia=

KOS

Linking and Mapping

CombinationIntegration

Jakob Voss : Knowledge Organization with Wikipedia. 5th NKOS Workshop, Sep 21,2006

[[Learn from Wikipedia]]

* Free you research

(open access)

* Free your data

(verifyability)

* Free your code

(open source)

* Free your KOS

(interoperability)

Full references are listed at http://bibliography.wikimedia.de