[Mailman-Developers] email schemas

[Barry Warsaw]

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On Jul 6, 2006, at 2:09 PM, John Dennis wrote:

>> As I understand it, any user agent is free to throw on any X-header
>> their little heart desires, so that strikes me as a lack of a-priori
>> knowledge.
>
> No problem, silently ignore unknown fields.

I don't think you'll want to do that.  There's lots of good meat in  
them thar X- headers!

> Since you'll going to have to deal with unknown names I think I would
> prefer both well known names and unknown extended names have identical
> document structure rather than special casing the extended names in an
> independent way. Special casing during a document traversal based on
> context introduces unnecessary pain.

I'm not sure I agree.  The structural parts of the message are  
header, field name, field value, etc.  "To", "From", "Subject" and  
such feels like content to me.

- -Barry

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