HUTN — Issue : Section 6.3

Issue : Section 6.3 : Ambiguous meaning when omitting opening and closing brackets
In 6.3 in the first paragraph it's said that opening and closing brackets should be optionnaly omitted
if the instance has no contents. This is error prone and ambiguous since one cannot distinguish between
a definition without contents from a contained instance whose definition (full representation) is forwarded.
Suggestion for resolution: remove the sentence (open and close brackets are not allowed to be omitted).

see below