Re: Correct definition of ContentInfo in CMS-10

["Bonatti, Chris" <[e-mail]>]

    I would submit that the 'content' field in the General Syntax section is
correct.  The instance of OPTIONAL in the appendix must be a copy artifact
from the 'EncapsulatedContentInfo', in which the 'content' field is
correctly optional.  I can see no legitimate use of CMS in which you would
send only a 'contentType' OID.  Even if someone were sending a "detached
content" in a separate body part, either MIME or X.400 mail systems are
perfectly capable of attaching a content types for that information without
utilizing this structure.

Russ,

    Browsing through my historical archive of now "non-existent" I-Ds, I see
that the OPTIONAL tag seems to have fallen out of the General Syntax
starting in version 3 of CMS.  Do you remember the reasoning behind the
change?

Chris



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 |  International Electronic Communication Analysts, Inc.      |
 |  Christopher D. Bonatti             15309 Turkey Foot Road  |
 |  Principal Engineer              Darnestown, Md 20878-3640  |
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____________________

William Ottaway wrote:

> Within the body of CMS 10 ContentInfo is defined as : -
>
> ContentInfo ::= SEQUENCE {
>         contentType ContentType,
>         content [0] EXPLICIT ANY DEFINED BY contentType }
>
> However, in the appendix ContentInfo is defined as : -
>
> ContentInfo ::= SEQUENCE {
>      contentType ContentType,
>      content [0] EXPLICIT ANY DEFINED BY contentType OPTIONAL }
>
> I assume the one within the body (i.e. content not optional) is correct.
>
> Bill.
>
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> All opinions are my own.