SPARQL Endpoint & Federation
The Artsdata.ca SPARQL endpoint is mainly used internally due to the complexity of writing SPARQLs.
For an example of federated queries that combine Artsdata.ca and Wikidata check out Culture inTime demo built in the 2 day Swiss #GLAMhack2020 hackathon - see GitHub repository
Wikidata Interlinking
Artsdata.ca has created property P7627 in Wikidata for linking entities from Wikidata to Artsdata.ca