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title subtitle date doi author institute header-includes
State of identifiers in Wikidata
WikidataCon 2017, Berlin
2017-10-28
name
Jakob Voß
Verbundzentrale des GBV (VZG)

id items : ISO 3166-1 alpha-3 code ([Q1341492])
ISBN ([Q33057])
...
\

id properties : ISO 3166-1 alpha-3 country code ([P298])
ISBN-13 ([P212])
ISBN publisher prefix ([P3035])
...
\

id values : all values of statements with id properties
+ some id items, e.g. ZIP code 10048 ([Q4546087])

identifier items (1-2/4)

systems with identifiers

  • GeoNames ([Q830106]) $\rightarrow$ GeoNames-ID ([P1566])
  • ISO 3166-1:2013 ([Q25275]) $\rightarrow$ [P297], [P298], [P299], [P300]

identifiers of these systems

  • ORCID iD ([Q51044]) $\rightarrow$ ORCID iD ([P496])
  • Australian Business Number ([Q4823913])
    $\rightarrow$ Australian Business Number ([P3548])

\color{red} we don't always have/want both!

identifier items (3/4)

individual identifiers should be exceptions ($<$ 5,000)

  • ZIP code 10048 ([Q4546087])
  • .org top-level domain ([Q32131])
  • ...

\color{red} instance-of ([P31]) item types from last slide?

identifier items (4/4)

identifier classes are subclasses of unique identifier ([Q6545185])

  • language identifier ([Q2092812])
  • publication identifier ([Q36646373])
  • ...
  • Wikidata property for a unique identifier ([Q19847637])

\color{red} instance of ([P31]) item types from forelast slide?

Identifier properties

\centering

57% (2236/3911) of all properties

datatype external identifier or
Wikidata property for a unique identifier ([Q19847637])

		    .  **prop for uniq id**     .

external id 1952 192 string 84 url 4 item 2 quantity 1 monolingual text 1

\color{red} should all be classified under [Q19847637]?

{height=78%}

Classification of identifier properties (1/2)

Wikidata property for a unique identifier ([Q19847637])

Wikidata property...

  • ... for items about people ([Q18608871])
  • ... for authority control for people ([Q19595382])

\color{red} needs some cleanup \color{black}

Classification of identifier properties (2/2)

Classification of corresponding systems

  • identifier classes ([Q6545185])
  • classes of Knowledge Organization Systems:
    catalogs, registries, taxonomies... ([Q6423319])

\color{red} needs consensus

\color{red} related to previous questions

Wikidata as linking hub

\centering

{width=40%} \ {width=40%}

Summary

Questions

  • how to handle items about identifier systems
    and/or systems that have identifiers
    and their corresponding instances?
  • classify all external-id properties under [Q19847637]?
  • n-to-m mappings & the Bonny and Clyde Problem

Tools

\centering Join Wikidata:Identifiers!