comment 140 - type attribute for group

[Yves Savourel <ysavourel@enlaso.com>]

Just one note related to comment 140: no type attribute in group.
We don't have a type attribute in unit either.

In 1.2 both those elements have restype that is used fairly often, especially in translating resources. For example it helps getting
better exact matches or offering better context.

-ys