Maniphest T119775

Create WDQS service for snak / reference hashes
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	Addshore
	Nov 27 2015, 8:50 PM

Description

As I understand it the only way to query for a reference is to use the hash of said reference (example below)

SELECT ?s WHERE {?s prov:wasDerivedFrom wdref:7b7e7e8cce78cd60ee82a71ffa3dc6b063a9d37c}

Would it be possible to create a service that could create this hash from another query?
The creation of the hash can be found in the DataModel component https://github.com/wmde/WikibaseDataModel

My usecase for this is running the following query that lists all instance of language version of wikipedia

PREFIX wd: <http://www.wikidata.org/entity/>
PREFIX wdt: <http://www.wikidata.org/prop/direct/>
PREFIX wikibase: <http://wikiba.se/ontology#>

SELECT ?wiki ?wikiLabel WHERE {
   ?wiki  wdt:P31 wd:Q10876391 . 

  SERVICE wikibase:label {
    bd:serviceParam wikibase:language "en" .
   }
}

And then be able to get hashes from these and look for statements that are references using P143 -> (item id from the first query)

As I said I have no idea if this is possible so this ticket is a proposal / question as to if it can be done!

Related Objects

Mentioned In: T117234: Reproduce wikidata-todo/stats data using analytics infrastructure
Mentioned Here: P143 timeout errors loading boards

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Addshore created this task.Nov 27 2015, 8:50 PM

Addshore raised the priority of this task from to Needs Triage.

Addshore updated the task description. (Show Details)

Addshore added projects: Wikidata, Wikidata-Query-Service, WMDE-Analytics-Engineering.

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Addshore set Security to None.Nov 27 2015, 8:51 PM

Addshore moved this task from Incoming to Watching / External on the WMDE-Analytics-Engineering board.

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Christopher subscribed.Nov 28 2015, 7:36 AM

You can get reference hashes for objects using the http://www.wikidata.org/prop/reference/ predicate.

For example,

PREFIX wd: <http://www.wikidata.org/entity/>
PREFIX wdt: <http://www.wikidata.org/prop/direct/>
PREFIX prov: <http://www.w3.org/ns/prov#>

SELECT (count(distinct(?s)) AS ?scount) WHERE {
  ?wds wdt:P31 wd:Q10876391 . 
  ?wdref <http://www.wikidata.org/prop/reference/P143> ?wds . 
  ?s prov:wasDerivedFrom ?wdref .
}

This returns a count of 16,266,065 statements with the "Imported From a Wikipedia" style reference (from http://wdm-rdf.wmflabs.org)

Okay, closing as not needed.
I look like the queries with the ref hash and the thing about take the same time to execute too

Addshore moved this task from Watching / External to Done on the WMDE-Analytics-Engineering board.Nov 30 2015, 9:29 AM

Christopher mentioned this in T117234: Reproduce wikidata-todo/stats data using analytics infrastructure .Dec 3 2015, 12:38 PM

Create WDQS service for snak / reference hashesClosed, DeclinedPublicActions

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Create WDQS service for snak / reference hashes
Closed, DeclinedPublic
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