Hi,
I require the following clarification regarding syntax lists. A similar question had been posted before, but there is still one missing link (atleast in my understanding). Consider the following CLASS definitions -
CLASS1 ::= CLASS
{
&val1 INTEGER OPTIONAL,
&val2 INTEGER OPTIONAL
}
WITH SYNTAX
{
[&val1] [&val2]
}
There are two clauses in the ITU-T spec that I would like to bring attention towards - clause 10.10 and clause 10.12 b). If we would consider just 10.12b, then the above would be invalid. But if we consider clause 10.10, then if an object is defined with one value, the same would belong to &val1 (in my understanding). Now for the tough part, clause 10.10 will always resolve situations described in 10.12 b), which would as a result never be illegal. As such I am not sure of the purpose of clause 10.12b) or the situation covered by 10.12b and not by 10.10.
Clause 10.10: When, in the parse process, an "OptionalGroup" is encountered, and the following lexical item is syntactically
acceptable as the first lexical item in the optional group, then that group is assumed to be present. If it is not syntactically acceptable as the first lexical item in the optional group, then that group is assumed to be absent.
NOTE – In order to avoid unexpected effects, designers should normally make the first lexical item in an optional group
a "Literal".
Clause 10.12 b): The use of "OptionalGroup"s shall be such that at no time in the parsing process can a "Setting" appear
that could potentially be a setting for more than one "FieldName".
Thanking you.
Yours Sincerely
Ramaswamy
"Any intelligent fool can make things bigger, more complex, and more violent. It takes a touch of genius -- and a lot of courage -- to move in the opposite direction." - Albert Einstein
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