AddressSnapshot: node PostalAddress versus association PostalAddress?

Hello community,

perhaps a silly question for the experts here, but why is it that a node and an association have the same name?

How do I access the one or the other in ABSL?

Currently I'm using in an extension of AddressSnapshot:

this.PostalAddress.GetFirst()

But how would I access the node then?

Is this similar to using Common (collection) versus CurrentCommon (single entry)?

Best regards,

Christian.