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-bounces(a)lists.wikimedia.org> on behalf of
Olaf Simons <olaf.simons(a)pierre-marteau.com>
*Sent:* Monday, October 5, 2020 1:53 PM
*To:* Discussion list for the Wikidata project.
<wikidata(a)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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