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Conference azur::mcc

Title:DECmcc user notes file. Does not replace IPMT.
Notice:Use IPMT for problems. Newsletter location in note 6187
Moderator:TAEC::BEROUD
Created:Mon Aug 21 1989
Last Modified:Wed Jun 04 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:6497
Total number of notes:27359

51.0. "QUESTION - defining ASN.1 OPTIONAL in MSL" by FORTY2::BOONHAM (Chris) Tue Feb 06 1990 15:22

I'm trying to define an X.400 ORName TYPE in MSL:

ORName ::= [APPLICATION 0] SEQUENCE {
        address COMPONENTS OF ORAddress,
        directory-name [0] Name OPTIONAL }

How do I specify in MSL that the Name is optional? That is the ORName
might consist of an ORAddress, or an ORAddress and a Name.

If the Name is not present in the ASN.1, then the I don't want the director to
display it (not even Name with an null string). X.400 defines a lot OPTIONAL
attributes!

Suggestions welcome.

Chris.
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