When to use ItemList and when not to.

Hello,


If, for example, one considers Example #1 of
https://schema.org/MusicRecording#eg-14 and looks at the event key, one
sees a list of events. However, when looking at the event property from
https://schema.org/MusicGroup, it is defined to only take a type of
https://schema.org/Event.


A possibly similar property would be acceptedAnswer from
https://schema.org/Question. In this case, acceptedAnswer is defined to
accept either an Answer or ItemList.


As I understand it, as far as RDF is concerned, when a single value is
allowed, so is a list. It ultimately all reduces to rdf triples which does
not distinguish between a single value or a list.


I am not sure what the difference between the event property from
MusicGroup would be vs acceptedAnswer from Question would be to justify
using ItemList in one case but not the other.


Can anyone enlighten me?


Regards,

James