Help talk:Properties

New page as part of documentation overhaul

Hi all,

I created this page as part of my work on a larger sitewide documentation overhaul (more info on this here).

I still intend on moving the (now) duplicate content from Help:Statements as well as clarifying the language surrounding items/entities/entries/properties/etc in Wikidata on all other pages.

Please let me know if you have any suggestions on further improving this page. If you see something wrong (like a typo) or something that could be easily improved upon (like an example, confusing wording, or a label for a screenshot), please just go ahead and fix it - no need to comment here first!

Thanks. -Thepwnco (talk) 22:01, 3 July 2014 (UTC)

symmetric property = symmetric property constraint?

@Infovarius: How do symmetric property (Q18647518) and property constraint symmetric constraint (Q21510862) differ? If they differ this should be documented with examples. If both are the same, I'd propose to delete symmetric property (Q18647518). Here is a common list of properties with any of both. -- JakobVoss (talk) 11:50, 9 November 2017 (UTC)

SELECT DISTINCT ?p ?pLabel ?pDescription (GROUP_CONCAT(?type) AS ?types) {
  {
    { ?p wdt:P31 wd:Q18647518 . BIND ("instance" AS ?type) } UNION
    { ?p wdt:P2302 wd:Q21510862 . BIND ("constraint" As ?type) }
  }
  SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
} GROUP BY ?p ?pLabel ?pDescription

Try it!

One is for properties and the other is for items. The one for properties is equivalent to owl:SymmetricProperty while the other isn't. ChristianKl (✉) 13:19, 12 November 2017 (UTC)

Adding fields for constraints to the property proposal template

With UI support of constraints, they take a more central role about defining what a property is about. As a result it would be good to have consensus about the constraints for a new property when it gets created. What do you think about adding corresponding fields to our template? ChristianKl (✉) 13:21, 12 November 2017 (UTC) WikiProject Properties has more than 50 participants and couldn't be pinged. Please post on the WikiProject's talk page instead.

Why there are no categories for properties?

It looks like there are no categories for properties. For example SoundCloud ID - LiveJournal ID - iTunes artist ID. They all fit in a category like "Musician properties". Is there any specific reason for not having categories for properties? -- OneMusicDream (talk) 19:09, 27 July 2018 (UTC)

Yes, information is already recorded as instance of (P31) Wikidata property related to music (Q27525351). We tend to use statements to record information, not categories.--Jklamo (talk) 23:01, 28 July 2018 (UTC)

@Jklamo: I see. And Wikidata property to identify musical works. Thank you. OneMusicDream (talk) 06:55, 30 July 2018 (UTC)

Indeed, it doesn't make sense to have categories. It is easy to forget to add a property into a category. But it's almost impossible not to apply them tags like "Wikidata property related to music" because that happens at the very moment when they are created. And then, those tags are better than categories. OneMusicDream (talk) 20:05, 30 July 2018 (UTC)

Consensus about changing property constrains and source website?

Is there any best practice if somebody wants to change the "source website for the property" or the "property constraint" for a specific property? Cheers! Datawiki30 (talk) 20:45, 29 October 2018 (UTC)

order of properties on page

Hi, Scandinavian middle family name (P6978), which I proposed last December, has been accepted. Is there a way for this property to get sorted by default in between given name (P735) and family name (P734)? --1Veertje (talk) 09:30, 4 July 2019 (UTC)

Vera, the property order is defined at MediaWiki:Wikibase-SortedProperties. I suggest you propose your change on it's talkpage. HenkvD (talk) 21:42, 4 July 2019 (UTC)

Property status and withdrawal

Hi. Two questions which I did not find answers for on this help page:

1. Who sets the status of a proposed property to "ready"? Can the proposer do that or only a "property creator"?
2. How can one withdraw a proposal? I would guess that the discussion should be archived somewhere.

Thanks. Toni 001 (talk) 12:06, 24 December 2019 (UTC)

Definition

Hi all

I've just changed the Wikidata:Glossary term for property to the description on this page, here is the old one, maybe its helpful here somewhere

Property is the descriptor for a data value, or some other relation or composite or possibly missing value, but not the data value or values themselves. Each statement at an item page links to a property, and assigns the property one or several values, or some other relation or composite or possibly missing value. The property is stored on a page in the Property namespace, and includes a declaration of the datatype for the property values. Compared to linked data, the property represents a triplet's predicate.

Thanks

--John Cummings (talk) 14:07, 30 January 2020 (UTC)

Versionize_property_definitions_?

See Wikidata:Project_chat#Versionize_property_definitions_?. --- Jura 05:21, 17 February 2020 (UTC)

Using nested properties in Wikipedia infoboxes

(It's the wrong terminology, but I do not know what the right word is.)

I have started using data in infoboxes in ang:, which has few active editors so the Wikidata will be invaluable in keeping the data in infoboxes up to date and the boxes short. If I develop the Infobox for royalty, for example:

• There is no problem filling in this way "image" {{#property|P18}}, or "date of birth" {{#property|P560}}
• However I cannot work out how to do regnal dates: the property used for the start of the reign is 'P580' and end 'P582' but those are just "start time" and "end time" and can only be read in the context of the period to which they refer (say Q18810062). How do I say "{{#property|P580}} of Q18810062"?

Hogweard (talk) 20:21, 5 October 2020 (UTC)