rb krishna wrote:
> 
>      Is the following ASN.1 syntax correct.

Correct.

> If so , can any tell me what the does {EXTENSION :ExtensionSet} mean.
> and what does the @ symbol mean in ASN.1 .

Please have a look at the books:
http://www.oss.com/asn1/larmouth.html
http://www.oss.com/asn1/dubuisson.html

> Extension {EXTENSION:ExtensionSet} ::= SEQUENCE
>         {
> extensionId  EXTENSION.&extensionId                                                  
>   ({ExtensionSet}),
> extensionArgument   EXTENSION.&ArgumentType                                     
>({ExtensionSet}{@extensionId})
> }
-- 
Olivier DUBUISSON
france telecom R&D
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