On Tue, 5 Mar 2002, Bujji krishna R B wrote:
> Hello,
>
> I would like to know if the following ASN.1 construct a valid one.
>
> X ::= SEQUENCE {
>
> id1 OBJECT IDENTIFIER,
> id2 OBJECT IDENTIFIER,
> parameters1 ANY DEFINED BY id1 OPTIONAL,
> parameters2 ANY DEFINED BY id2 OPTIONAL
> }
No. It is invalid not only because of the ambiguity of
parameters1/parameters2, but because ANY has not been part of the ASN.1
standard for eight years now, and the 1988 standard which defines it -
X.208, is scheduled for withdrawal this year upon publication of
ASN.1:2002.
> Since both ANY fields are OPTIONAL, do we need to have context specific
> TAGS for ANY.
Correct. The tag could be PRIVATE or APPLICATION, but context-specific is
(IMHO) preferred.
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