Re: [stir] Proposal for update of erratum #6519 - ppt syntax

Roman Shpount <roman@telurix.com> Thu, 22 April 2021 17:11 UTC

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From: Roman Shpount <roman@telurix.com>
Date: Thu, 22 Apr 2021 13:11:06 -0400
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To: Christer Holmberg <christer.holmberg@ericsson.com>
Cc: Marc Petit-Huguenin <marc@petit-huguenin.org>, Russ Housley <housley@vigilsec.com>, IETF STIR Mail List <stir@ietf.org>
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Subject: Re: [stir] Proposal for update of erratum #6519 - ppt syntax
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On Thu, Apr 22, 2021 at 10:41 AM Christer Holmberg <
christer.holmberg@ericsson.com> wrote:

> >There are quite a few people who use ABNF grammars to create field
> parsers or validators. Providing them with the most specific grammar
> possible makes their job easier.
>
> In general I agree. But, people should not have to modify their existing
> parsers if they can already handle both quoted and non-quoted ppt values.
>
>
In general, they would not need to update the parser. The critical point
here is the opposite. We do not want to require that anyone who only
supports quoted tokens as the ppt value would have to update their parser
to support the quoted strings. If they choose to support full quoted
strings and then accept a wider range of values (like accept spaces around
the token), they can do so without causing any interop issues. As long as
they do not send anything that does not match the grammar, this is
acceptable.
_____________
Roman Shpount