Wikipedia talk:Category intersection

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About this proposal[edit]

This proposal was started by User:Rick Block and User:SamuelWantman. The initial discussions leading to the proposal are in Archive 1. There is also discussion about the different options here.

Please leave comments about the proposal on this page. Thank you for your input.

We need this[edit]

  1. Endorsed by Mr. Guye (talk) . We need this.--Mr. Guye (talk) 20:00, 19 March 2017 (UTC)
  2. Endorsed by HornetMike (talk) Seconded. Would be an extremely useful addition. HornetMike (talk) 14:24, 21 March 2017 (UTC)
  3. Endorsed by Eliz81 (talk) We need this yesterday. ~Eliz81(C) 20:19, 26 March 2017 (UTC)
  4. Endorsed by Jarble (talk) It might be worthwhile to discuss this issue at WP:Bot requests. Jarble (talk) 18:59, 3 June 2017 (UTC)
  5. Endorsed by Hoverfish (talk) An ideal solution for making use of categories, both for the reader and the editor. Would solve endless categorization disputes too. Hoverfish Talk 17:26, 15 July 2017 (UTC)
  6. Endorsed by Daask (talk) The currently existing category intersection categories are arbitrary. Should there be Category:Muslim African-American skiers of the 20th century? As a writer of new pages, I consider the effort I have to go through walking up and down the category tree and copying categories from similar articles to be a waste of my time. I wish I could just write Category:Muslims, Category:African-Americans, Category:Skiers, and Category:20th-century people and publish without looking up what (intersection) categories actually exist at all. Daask (talk) 18:37, 30 December 2017 (UTC)
  7. Endorsed by User:Dthomsen8 . We need this tool.--Dthomsen8 (talk) 03:53, 5 January 2018 (UTC)
  8. Endorsed by Donama (talk) . Have been waiting for a long time. Donama (talk) 05:23, 5 January 2018 (UTC)
  9. Endorsed by NisJørgensen (talk) A little bit disheartening to ese that this has been discussed for more than 10 years ...
  10. Endorsed by PRZ (talk) . We need this. There is absolutely no point having a fully hierarchical system on the web. This creates big mess. And yes, that should have been done from start...--PRZ (talk) 10:06, 9 June 2018 (UTC)

Two or three types of categories[edit]

Currently we have three types of categories: container categories, partially diffused categories, and categories with articles only. According to the proposal we should cut out the second type of categories. However, I'm not sure how, because articles hugely differ in the broadness of their topic, and that is why we use partially diffused categories. For example we have Europe and we have Paris and we have Bastille which you will currently find at different category levels in the same tree. How is that going to work in this proposal? Marcocapelle (talk) 09:12, 16 December 2017 (UTC)

It's a simple algorithm for the implementation to handle this. I'm pretty sure some circular paths exist in categories exist, but there are ways to handle this programatically too. If you try to perform an intersection on a huge tree-trunk category like Category:Europe then you can expect to have the result arrive slowly or the members of the intersection too numerous to be meaningful. What we want is community push to get this feature. Implementation details should be a secondary concern. Donama (talk) 05:29, 5 January 2018 (UTC)

Archive is broken[edit]

It seems Wikipedia_talk:Category_intersection/Archive_2 is missing, meaning there is no way to navigate to Wikipedia_talk:Category_intersection/Archive_3. NisJørgensen (talk) 10:42, 20 January 2018 (UTC)

It says at Wikipedia talk:Category intersection/Archive 2:
Why that was done remains a mystery. I think the easiest repair is to move Wikipedia talk:Category intersection/Archive 3 to .../Archive 2 and set |counter=2 in {{User:MiszaBot/config}} above. -- Michael Bednarek (talk) 11:13, 20 January 2018 (UTC)
Moved 3 to 2 per request. Dekimasuよ! 17:51, 7 August 2018 (UTC)