Hi,
I have some observations and based on those I have the following
queries. I had improved the prev ASN.1 spec for the analysis. Pls find the
spec here -
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
>
ParameterList DEFINITIONS AUTOMATIC TAGS ::=
BEGIN
--ParameterList1 { hehe } ::= hehe
ValueSet INTEGER ::= { 1|3|5|7|9 }
ParameterList2 { Governor , Governor:Type } ::= SEQUENCE
{
value Type
}
ParameterList3 { Governor, Governor:value } ::= SEQUENCE
{
val Governor DEFAULT value
}
VS ::= SEQUENCE
{
val1 ValueSet
}
PL2-1 ::= ParameterList2 {INTEGER, {0..100}}
PL2-2 ::= ParameterList2 {REAL, {0|PLUS-INFINITY|MINUS-INFINITY}}
PL2-3 ::= ParameterList2 {BIT STRING(SIZE(65536)), {'0'H|'1'H|'2'H|'3'H}}
PL3-1 ::= ParameterList3 {REAL,0}
PL3-2 ::= ParameterList3 {INTEGER,10}
pl2-1 PL2-1 ::= { value 6 }
pl2-2 PL2-2 ::= { value { mantissa 1, base 2, exponent 10 } }
END
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
>
I am not convinced about the interpretation of PL2 presented before for
the following reasons. Kindly correct if my inference is mistaken. This code
is interpreted differently by different syntax checkers. In one case the
value 'field' of PL2-1, PL2-2, PL2-3 were considered as OpenType, and in
another place it was the 'Governor' alone that was considered not the 'Type'
that is governed by the 'Governor'. To be precice PL2-1 was INTEGER, PL2-2
was REAL and PL2-3 was BIT STRING(SIZE(65536)). This I infered from the fact
that in the value - assignment pl2-2 the real value specified is not within
the limits (single value's) of the value set and the syntax checker did not
mention anything about the same. This led me to infer that the ValueSet
given for 'Type' is not considered at all. I'm not very sure of the
behaviour I mentioned in the few sentences above, but this is my inference.
In my understanding the ASN.1 language specifies as to what is OpenType
and what is not. And further for the the 'val1' field of Type 'VS' the
ValueSet mentioned were taked into consideration. Would the following
inference be valid - "If a ValueSet is passed as a parameter and it
representes a type within a constructed type (SEQ/SET/CHOICE not an object
class) then, only the type(governor) is considered and not the value set
itself". I understand that this cannot be the case for an ObjectSet since an
ObjectSet would only be used in an ObjectClass. Kindly explain.
Regds
Ram
----- Original Message -----
From: "Bancroft Scott" <[EMAIL PROTECTED]>
To: "Ramaswamy" <[EMAIL PROTECTED]>
Sent: Monday, June 23, 2003 5:06 PM
Subject: Re: [ASN.1] Interpretation?
> On Mon, 23 Jun 2003, Ramaswamy wrote:
>
> > Hi,
> > As part of my learning of ASN.1 I wrote the following ASN.1 spec, so
this code serves no other purpose that aid in my understanding of the ASN.1
language. Pls read thru the following spec -
> >
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
> > ParameterList DEFINITIONS AUTOMATIC TAGS ::=
> > BEGIN
> > --ParameterList1 { hehe } ::= hehe
> > ValueSet INTEGER ::= { 1|3|5|7|9 }
> > ParameterList2 { Governor , Governor:Type } ::= SEQUENCE
> > {
> > value Type
> > }
> > ParameterList3 { Governor, Governor:value } ::= SEQUENCE
> > {
> > val Governor DEFAULT value
> > }
> > PL2 ::= ParameterList2 {INTEGER, {1|2|3|4|5}}
> > PL3 ::= ParameterList3 {REAL,0}
> > pl2 PL2 ::= { value 6 }
> > END
> >
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
> >
> > I understand that PL3 is equivalent to the following
> > >>>>>>>>>>>>>>>>>>
> > PL3 ::= SEQUENCE
> > {
> > val REAL DEFAULT 0
> > }
> > >>>>>>>>>>>>>>>>>>
> >
> > If the above interpretation is correct then how is PL2 to be
> > interpreted?? Is it just the type that is considered, in which case
> > what happens to the ValueSet specified. Thanking you.
>
> It is interpreted the same as if you had defined Type as a
> valuesetreference and ParameterList2 were not parameterized.
> Or put another way:
>
> PL2 ::= SEQUENCE
> {
> value INTEGER (1|3|5|7|9)
> }
>
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