Thank you, Lucas, for the solution! It was very simple indeed, but,
shame on me, I confess I did'nt know this fundamental property path.
All the best,
Bruno
Le 05/10/2020 à 21:36, Lucas Werkmeister a écrit :
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
<https://query.wikidata.org/#SELECT%20DISTINCT%20%3Fitem%20%3FitemLabel%20WHERE%20%7B%0A%20%20wd%3AQ177329%20%28wdt%3AP22%7Cwdt%3AP25%29%2a%20%3Fitem.%0A%20%20SERVICE%20wikibase%3Alabel%20%7B%20bd%3AserviceParam%20wikibase%3Alanguage%20%22%5BAUTO_LANGUAGE%5D%2Cen%22.%20%7D%0A%7D>:
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:Graph
PREFIX 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-boun...@lists.wikimedia.org> on behalf of
Olaf Simons <olaf.sim...@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 ties
Dear 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
Mobil: +49-179-5196880
Privat: Hauptmarkt 17b/ 99867 Gotha
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