A picker context that browses a tree, and therefore has a location.
The alias is the one every picker context is provided under; the discriminator is what narrows it to those that can
be browsed. A picker with no location — a flat collection picker, say — deliberately does not match.
A picker context that browses a tree, and therefore has a location.
The alias is the one every picker context is provided under; the discriminator is what narrows it to those that can be browsed. A picker with no location — a flat collection picker, say — deliberately does not match.