Cardinality information is absent

[PGijsbers]

Neither in the exported JSON nor in the built documentation is there any mention of the cardinality of the relationships. E.g., can an educational resource have multiple learning modes, or just one? I cannot tell.

[antoniskappa]

When no cardinality information is declared, 0-n is implied. I think this is reflected in the exported JSON (in the "cardinality" object when present). In previous discussions, we have decided that we should avoid as much as possible cardinality restrictions, but if this has changed, please indicate the properties where we should define such restrictions.

[PGijsbers]

Sorry, I missed that detail. I'm mostly missing the distinction between 1:1 and any other form of cardinality. For example, with an educational resource that it would have multiple enrollment end dates? The description speaks of the end date. Or perhaps required competency is a better example, where just one makes more sense?