rb krishna wrote:
> 
> Hi,
>      Is the following ASN.1 syntax correct. If so , can any tell me what the does 
>{EXTENSION :ExtensionSet} mean.
> and what does the @ symbol mean in ASN.1 .
> 
> Extension {EXTENSION:ExtensionSet} ::= SEQUENCE
>         {
> extensionId  EXTENSION.&extensionId                                                  
>   ({ExtensionSet}),
> extensionArgument   EXTENSION.&ArgumentType                                     
>({ExtensionSet}{@extensionId})
> }
> 
> Thanks,
> krishna

Yes, it is correct.
The first is parameterization as specified in X.683
The second is "ComponentRelationConstraint" as specified in X.682.

Best regards
Egon Andersen
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