Hi, a problem seems (not very surprisingly) to emerge into Wikidata : the managing of the evolution of how we do things on Wikidata.
Properties are deleted, which made some consumer of the datas sometimes a little frustrated they are not informed of that and could not take part of the discussion.
My question is : is it a community problem, a technical problem, or both ? IMO it is a very serious problem for a project of the size of Wikidata that just leaving to humans to make notifications to whoever uses te datas could be a disaster.
We therefore need to have tools to manage that, part of the solution is from the technical side.
I'll try to do a review of which tools we have now, as tools, to make notifications from people who want to make a change that imacts other projects or people, and interestec projects or people:
* Purely human : someone who make a change in a model or delete a property is responsible to notify every projects he knows would be impacted. This is tedious and imperfect, and imperfectly pass through language barriers, if he has to notify every Wikipedias.
* Using watchlists : This is a semi automated process. Every people involved into a project, model, or property has to follow the relevant pages. Still imperfect for many reasons.
* Using the notify extensions, like the ping projects or ping user templates, interproject, this may need software solutions from the developper of the Echo Mediawiki extensions