Wikidata:WikidataCon 2017/Submissions/Ontology Cleanup

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Pictogram voting info.svg This is an Open submission for WikidataCon 2017 that has not yet been reviewed by the members of the Program Committee.

Submission no. 47
Title of the submission

Class Hierarchy Cleanup Workshop

Author(s) of the submission

Arthur Smith (ArthurPSmith)

E-mail address

Country of origin

United States

Affiliation, if any (organisation, company etc.)

American Physical Society

Type of session


Length of session

1 hour

Ideal number of attendees


EtherPad for documentation


Wikidata has a class hierarchy via the instance of (P31) and subclass of (P279) properties, but often these are applied inconsistently. Some of the most obvious problems are listed under Wikidata:WikiProject Ontology/Problems, but many other issues have been raised in Project Chat and elsewhere. In this workshop participants will discuss these problems and how to fix them, and will take charge in executing those fixes either immediately or in subsequent days depending on the scale of the fix required.

What will attendees take away from this session?
  1. A better understanding of how to properly use our class relationship properties (see also Help:Basic Membership Properties)
  2. A feeling of responsibility and knowledge of how to find and address class hierarchy problems in Wikidata
  3. A cleaner ontology for everybody who uses Wikidata
Slides or further information
Special requests

Interested attendees[edit]

If you are interested in attending this session, please sign with your username below. This will help reviewers to decide which sessions are of high interest.

  1. --Andrawaag (talk) 11:00, 25 July 2017 (UTC)
  2. --YULdigitalpreservation (talk) 18:20, 25 July 2017 (UTC)
  3. --SammyWiki 17:24, 27 July 2017 (UTC)
  4. Daniel Mietchen (talk) 07:56, 31 July 2017 (UTC)
  5. Markus Krötzsch (talk) 09:05, 31 July 2017 (UTC)
  6. Alessandro Piscopo (talk) 14:27, 31 July 2017 (UTC)
  7. Jklamo (talk) 00:06, 1 August 2017 (UTC)
  8. Gstupp (talk) 17:24, 1 August 2017 (UTC)
  9. --Micru (talk) 14:07, 11 August 2017 (UTC)
  10. Sic19 (talk) 20:50, 20 August 2017 (UTC)
  11. Salgo60 (talk) 15:32, 28 October 2017 (UTC)
  12. ...