Property talk:P3876

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category for alumni of educational institution
category containing people who studied at this institution

Description	category containing people who studied at this institution
Represents	alumnus (Q508719), Wikimedia category (Q4167836)
Data type	Item
Domain	According to this template: educational institution (Q2385804) According to statements in the property: educational organization (Q5341295) or fictional educational institution (Q15690029) When possible, data should only be stored as statements
Allowed values	Wikimedia category (Q4167836) (note: this should be moved to the property statements)
Example	Belarusian National Technical University (Q815268) → Category:Belarusian National Technical University alumni (Q9401297) Belarusian State University (Q2418908) → Category:Belarusian State University alumni (Q7692692) Baranagore Ramakrishna Mission Ashrama High School (Q19882251) → Category:Baranagore Ramakrishna Mission Ashrama High School alumni (Q60812396)
Source	wikipedia categorization (note: this information should be moved to a property statement; use property source website for the property (P1896))
Robot and gadget jobs	DeltaBot does the following jobs: <DeltaBot-addValueClaim>
See also	educated at (P69), category for people born here (P1464), category for people who died here (P1465), category for people buried here (P1791), category for employees of the organization (P4195), member category (P6365), related category (P7084)
Lists	Items with the most statements of this property Count of items by number of statements (chart) Items with the most statements Items with the fewest statements Count of items by number of sitelinks (chart) Items with the most sitelinks Items with the most sitelinks, but no link to one Wikipedia (sample: Welsh Wikipedia, cywiki) Items with the fewest sitelinks Most linked wikis Items with the most identifier properties By value of property Most statements Fewest statements Most sitelinks Most linked wikis Most identifiers Items with no other statements Most recently created items Items with novalue claims Items with unknown value claims Usage history (total) Usage history (main statement) Chart by item creation date Database reports/Constraint violations/P3876 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 16,669 Main statement 16,663 >99.9% of uses Qualifier 5 <0.1% of uses Reference 1 <0.1% of uses
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[create Create a translatable help page (preferably in English) for this property to be included here]

Value type “Wikimedia category (Q4167836)”: This property should use items as value that contain property “instance of (P31)”. On these, the value for instance of (P31) should be an item that uses subclass of (P279) with value Wikimedia category (Q4167836) (or a subclass thereof). (Help)

List of violations of this constraint: Database reports/Constraint violations/P3876#Value type Q4167836, hourly updated report, SPARQL

Property “category combines topics (P971): alumnus (Q508719)” declared by target items of “category for alumni of educational institution (P3876)”: If [item A] has this property with value [item B], [item B] is required to have property “category combines topics (P971): alumnus (Q508719)”. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P3876#Target required claim P971, SPARQL

Inverse property of “category combines topics (P971)”:
if [item A] has this property (category for alumni of educational institution (P3876)) linked to [item B],
then [item B] should also have property “category combines topics (P971)” linked to [item A]. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P3876#inverse, SPARQL

Distinct values: this property likely contains a value that is different from all other items. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303). Known exceptions: University of Strasbourg (Q157575), University of Strasbourg (Q20808141)
List of violations of this constraint: Database reports/Constraint violations/P3876#Unique value, SPARQL (every item), SPARQL (by value)

Single value: this property generally contains a single value. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P3876#Single value, SPARQL

Item “country (P17)”: Items with this property should also have “country (P17)”. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P3876#Item P17, search, SPARQL

Type “educational organization (Q5341295), fictional educational institution (Q15690029)”: item must contain property “instance of (P31)” with classes “educational organization (Q5341295), fictional educational institution (Q15690029)” or their subclasses (defined using subclass of (P279)). (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P3876#Type Q5341295, Q15690029, SPARQL

Property “category contains (P4224): human (Q5)” declared by target items of “category for alumni of educational institution (P3876)”: If [item A] has this property with value [item B], [item B] is required to have property “category contains (P4224): human (Q5)”. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P3876#Target required claim P4224, SPARQL

Item “instance of (P31)”: Items with this property should also have “instance of (P31)”. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303). Known exceptions: Institut d'études politiques (Q1475041)
List of violations of this constraint: Database reports/Constraint violations/P3876#Item P31, search, SPARQL

Allowed entity types are Wikibase item (Q29934200): the property may only be used on a certain entity type (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P3876#Entity types

Scope is as main value (Q54828448): the property must be used by specified way only (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P3876#Scope, SPARQL

This property is being used by: uk:Шаблон:Картка:Університет, uk:Шаблон:Коледж, uk:Шаблон:Заклад вищої освіти Please notify projects that use this property before big changes (renaming, deletion, merge with another property, etc.)

Discussion

What is the point?

When you want to indicate that a category includes people who studied at an institution, you can use "is a list of" "people" with qualifier "educated at" "whatever institution". It has been a best practice for years and is supported by Reasonator. Thanks, GerardM (talk) 07:40, 13 May 2017 (UTC)

@GerardM: The idea is that if someone has statement with educated at (P69) that points to some institution and that institution has statement with category for alumni of educational institution (P3876), we can automatically place article about that person into corresponding alumni category (implemented in ru-wiki). I can see that you proposal is more generic, but I'm not sure I understand it. Can you please give me an example of similair statements? --Ghuron (talk) 15:59, 21 August 2017 (UTC)

Check Q7006056 and its Reasonator page all doing exactly what you say you need. Thanks, GerardM (talk) 06:15, 29 November 2017 (UTC)

@GerardM: I agree that in ideal world, I can query in lua "give me category with P971:Q508719 and P971, that points to the person "alma-mater". The problem is that there is no such API in lua (see my comment on phab:T185313 from Apr 18). Reasonator can use SPARQL end-point, but we cannot do this for infobox generation due to performance reasons. --Ghuron (talk) 04:31, 24 April 2018 (UTC)

@Ghuron: In an ideal world you would not use Wikidata to query what a category contains in order to query the category for its content.. Particularly when that same information is already in Wikidata. It makes more sense to set up regular updates to Wikidata for content from categories. It makes more sense as well because the categories often do not contain the information available in Wikidata. Thanks, GerardM (talk) 05:09, 24 April 2018 (UTC)

@GerardM: Let me describe what I am trying to achieve. Let's take a random bio-article: en:Richard S. Arnold. Right now this article does not seems to be using wikidata, but technically there are no problems to populate "alma maters" field in infobox from Q7328805. But besides infobox, there are 3 categories there as well: en:Category:Harvard Law School alumni, en:Category:Phillips Exeter Academy alumni, en:Category:Yale University alumni. Again, with a few lines of lua code, I can automatically place article in those categories by requesting P3876 statements from Q1426464, Q49112 and Q49112. In fact we are doing that in ru-wiki for months. Ideally I should not use P3876 but instead request those categories as reasonator did in example above. The same applies for P971:Q3406134, P971:Q1322263, P971:Q19660746, etc.

What you are trying to describe is something much more ambitious. I guess we need to get there step by step --Ghuron (talk) 05:35, 24 April 2018 (UTC)