On 9/20/17 5:57 AM, Alexey Melnikov wrote:
Since there is an IANA registry, another possibility would be to not attempt to
revise the syntax from 5322 at all.
On my memory most of new header fields are defined without extending
"optional-field" production. So people are already doing what you propose.
Instead, simply rely on the the extensibility already there via
<optional-field> and register all the new header fields in the IANA registry.
(Use ABNF to define the syntax of the individual new headers but not their linkage
into the message.)
Then use text to specify conditions about where they may appear in a message.
Right.
OK. Barring further comments to the contrary I will revise my review
(and the erratum) to recommend this approach.
Thanks,
Paul
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