CORBA35 — "Safe" keyword identifier issue

Summary: Above rules seem to imply that the
"safe" keyword identifier can only occur before the first scoped name in the
<value_parent_spec>, whereas I think the actual intent is that it can only
occur before a non-abstract value type, of which there is at most one in the
list, although it need not be the first. Since this can"t be expressed in the
rules exactly, I would simply amend the rule to be:

<value_parent_spec> ::= ":" [ <safe_token> ] <scoped_name>

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and simply express the semantic restriction in the text. There already is a
brief mention of the semantics of the "safe" keyword in section 5.3.2.5
"Substitutability Issues". Perhaps another sentence or two would help clarify
the intended usage.