Docs on Blazegraph deletion issue

[JeroenDeDauw]

Currently, Blazegraph does not delete mappings of properties when updating the property, causing a duplication to happen on each update.

Current RDF: view-source:https://rdf.wikibase.wiki/wiki/Special:EntityData/P1.rdf does not work:

wdt:P1 a owl:ObjectProperty ;
	owl:sameAs <http://www.w3.org/2000/01/rdf-schema#subClassOf> .

Old RDF: works as expected:

wd:P1 owl:sameAs <http://www.w3.org/2000/01/rdf-schema#subClassOf> .

Not attempted yet:

wdt:P1 owl:sameAs <http://www.w3.org/2000/01/rdf-schema#subClassOf> .

[lozanaross]

@JeroenDeDauw we are trouble shooting some issues with the extension. Did you ever install a query service with the demo wiki instance? Did you have to do any special settings on the Blazegraph instance if yes?

[JeroenDeDauw]

The demo wiki at https://rdf.wikibase.wiki does not have the query service, and we cannot quickly set it and Wikibase RDF up and configure it.

[lozanaross]

OK, no problem - did you ever set up a Blazegraph instance & query service for testing, just out of curiosity? We're having issues with the Blazegraph settings and trying out different ways to debug.

[JeroenDeDauw]

Probably we did during initial development, but I am not sure.