In December 2022, using data from my SemJoconde graph, I automatically created a Wikidata entity describing Jan Sadeler's "Nativity".

(https://www.wikidata.org/entity/Q115621575).

Pour la propriété 'described at URL', j'avais indiqué l'URL de la page POP qui décrit cette même œuvre: https://www.pop.culture.gouv.fr/notice/joconde/02110007978. POP est une représentation WEB d'entités décrites dans la base de données Joconde.

For the 'described at URL' property, I had indicated the URL of the POP page that describes this same work: https://www.pop.culture.gouv.fr/notice/joconde/02110007978. POP is a WEB representation of entities described in the Joconde database.

SemJoconde is my knowledge graph representation of the Joconde database. The graph model used is based on CIDOC-CRM. It is therefore quite different from the model used by Wikidata. The entity corresponding to Jan Sadeler's work in SemJoconde is:

http://datamusee.givingsense.eu/onto/event/creation/02110007978.

A Wikidata contributor has replaced the value associated with 'described at URL' with https://collections.mba.rennes.fr/ark:/10946/0027978. This is a page from the Musée des Beaux-Arts de Rennes website where the work is described. This work is curated (exhibited?) at the Musée des Beaux-Arts de Rennes. This suggests that we find equivalent links for all the works conserved at the Musée des Beaux-Arts de Rennes.

What's more, we'll see below that the availability of this link enabled us to find good quality images to enrich the description of this work in Wikidata and SemJoconde.

On SemJoconde, the query

SELECT ?event WHERE {
  ?event <http://erlangen-crm.org/current/P14_carried_out_by> <http://joconde.givingsense.eu/onto/creator/42982/WKQ3161745/sadeler-jan> .
}

shows us that there are 31 works by Jan Sadeler referenced in SemJoconde.

The query:

SELECT ?curator (count(?event) as ?c)WHERE {
?event http://erlangen-crm.org/current/P14_carried_out_by http://joconde.givingsense.eu/onto/creator/42982/WKQ3161745/sadeler-jan;
http://erlangen-crm.org/current/P108_has_produced ?object .
?object http://datamusee.givingsense.eu/onto/DMP18_has_current_curator ?curator
}
group by ?curator

We have found that there are two conservation sites referenced by SemJoconde for works by Jan Sadeler:

• the Musée des Beaux-Arts in Rennes, with 30 works
• the Musée du Hiéron in Paray-le-Monial, with one work.

We can therefore take advantage of the link with the Musée des Beaux-Arts de Rennes for the bulk of Sadeler's works.

The query:

SELECT (count(?object) as ?c)WHERE {
?object <http://datamusee.givingsense.eu/onto/DMP18_has_current_curator> <http://joconde.givingsense.eu/onto/site/WKQ3098373>
}

shows us that 8301 works from the Musée des Beaux-Arts de Rennes are referenced in SemJoconde. The following query on WDQS:

select * where{ ?e wdt:P276 wd:Q3098373 }

shows us that (as of September 27, 2023) only 171 entities are known to Wikidata to be located at the Musée des Beaux-Arts de Rennes (and we could see that only 114 have a Joconde ID). So it's likely that we can enrich the Wikidata and SemJoconde data if we can link to the right museum pages. The URL provided by the Wikidata contributor for Jan Sadeler's work proves to be a mine of additional information. In fact, I've discovered that by adding the suffix '.json', we can retrieve a json structure with lots of useful information that isn't in the extract of the SemJoconde graph I used to create the Wikidata entity.

Update on 1/1/2024
Thanks mainly to our work, there are now 5753 works from the Musée des Beaux-Arts de Rennes in Wikidata