Yes, that's exactly what I would have expected to happen, with the // as a prime candidate for that separator.

Big-endian domain names would have been very nice to have though, if only because it would have been a lot more orderly than the current jumble.

Big-endian for the 'major' components and the path name, little-endian for the host portion seems a bit weird.

mail:/com/domain/hostname//username

Would look strange though...