Bruno
I don’t understand the problem, the query shouldn’t need to get much more complicated… what kind of query did you have in mind? Here’s a simple one for all ancestors of Frodo Baggins:
SELECT DISTINCT ?item ?itemLabel WHERE {
wd:Q177329 (wdt:P22|wdt:P25)* ?item.
SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
}
Cheers,
Lucas
On 05.10.20 19:10, Bruno Belhoste wrote:
It works well, but it's a descendant tree (the father of Djingis Khan is not in the tree). My question is how to explore family trees in the opposite direction, I mean from children to parents, and more generally to get all the relatives of a given person. The fact that there are two different properties, one for the child-father link and one for the child-mother link, makes the query much more difficult in this case.
Le 05/10/2020 à 15:58, Magnus Sälgö a écrit :
Have you tested gas:traversalDirection below we follow child gas:traversalDirection "Undirected"
example https://w.wiki/fDz
#People related to Djingis Khan#defaultView:GraphPREFIX gas: <http://www.bigdata.com/rdf/gas#>
SELECT ?item ?itemLabel ?pic ?WikiTreef ?FindAGravef ?linkTo {SERVICE gas:service {gas:program gas:gasClass "com.bigdata.rdf.graph.analytics.SSSP" ;gas:in wd:Q720 ;gas:traversalDirection "Undirected" ;gas:out ?item ;gas:out1 ?depth ;gas:maxIterations 4 ;gas:linkType wdt:P40 .}OPTIONAL { ?item wdt:P40 ?linkTo }OPTIONAL { ?item wdt:P18 ?pic }SERVICE wikibase:label {bd:serviceParam wikibase:language "sv" }}
From: Wikidata <wikidata-bounces@lists.wikimedia.org> on behalf of Olaf Simons <olaf.simons@pierre-marteau.com>
Sent: Monday, October 5, 2020 1:53 PM
To: Discussion list for the Wikidata project. <wikidata@lists.wikimedia.org>
Subject: Re: [Wikidata] a question of data modeling about family tiesDear Wikidata list,
one of our big contributors, Bruno Belhoste in Paris, just gave me a weird question which I feel I cannot answer that fast.
We, FactGrid, are a Wikidata child and so it came that we adopted structures like the father/mother differentiation. Bruno's question is now whether it would not have been wise to just create just a "parent" option instead of the gender fork that splits the lineages. Let me insert his mail:
> Dear Olaf,
>
> I have a question of data modeling in FactGrid concerning family ties.
> We have one property for children (P150) and also one for siblings
> (P203), but two different properties for parents: father (P141) and
> mother (P142). The problem is: how can you get all the members of the
> family of somebody? One have (1) to explore both the matrilinear trees
> and the patrilinear trees at each generation to get all the ancestors
> and (2) to get all the descents of these ancestors. It is very complex.
> It would be much simpler to have only one property including the father
> and the mother.
>
> In case we choose this solution, it would be easy to transform all the
> triples with P141 or P142 into triples with the new property. What do
> you think about that? Have you another solution for querying family links?
>
> All the best,
>
> Bruno
I wonder what people with more data knowledge think about the proposal (which would affect just our site, not Wikidata...) (so: no worries, we can do experimental things without affecting our parent - I hesitate to speak of a father or mother - Wikidata).
Best,
Olaf
Dr. Olaf Simons
Forschungszentrum Gotha der Universität Erfurt
Schloss Friedenstein, Pagenhaus
99867 Gotha
Büro: +49-361-737-1722
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Privat: Hauptmarkt 17b/ 99867 Gotha
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