UMLR — Multiplicity of Comment's "owningElement" (composition/aggregation end next to Element) in UML diagram for Root should be 1 and not 0..1

Since only Package elements override the virtual operation of Element "mustBeOwned()" to return false, this means that all other objects derived from Element except packages must have exactly one owner.

References: Figure 7.1 Root, p. 63; 7.8.6.5 Operations "mustBeOwned()", p. 85

Under the machine-generated description of Comment on p. 82, there is no mention of the association end for the aggregation, only for "annotatedElements".

Other questions about Comment:

1. Does it make sense for a Comment to have an empty body?
2. Since a Comment is not a NamedElement, how would we want to access a single comment out of a possible set of Comments?
3. Should the body attribute of Comment at least be unique within the set of Comments owned by a given Element?