User based sources
I'll describe the use case we encounter on Hubl here. I need you @balessan, @calummackervoy or @sylvain to translate that into something that makes sense in DjangoLDP's terms.
On Hubl, we have job offers. We'd like to be able to notify users when a new offer is posted, but notify who?! We figured the good answer is to notify the users who subscribed to your container of job opportunities, which could mean having users chose from which sources they want to receive opportunities from, and having a backlink from the job offer container to the subscribing users to be able to notify them when a new job offer is posted.