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

Christer Holmberg <christer.holmberg@ericsson.com> Thu, 22 April 2021 14:41 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Roman Shpount <roman@telurix.com>
CC: Marc Petit-Huguenin <marc@petit-huguenin.org>, Russ Housley <housley@vigilsec.com>, IETF STIR Mail List <stir@ietf.org>
Thread-Topic: [stir] Proposal for update of erratum #6519 - ppt syntax
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Date: Thu, 22 Apr 2021 14:41:51 +0000
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Subject: Re: [stir] Proposal for update of erratum #6519 - ppt syntax
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Hi,

>> I have not been able to follow the discussion in detail, but is there a reason why we simply can's say:
>>
>> ident-type = "ppt" EQUAL token / quoted-string
>>
>> ...and then add text saying that the only token characters are allowed?
>
>I believe that exceptions to ABNF should be kept to the minimal necessary.

My suggestion is a subset of generic-param, which is the generic syntax for the parameters.

>There is no reason not to keep ABNF as specific as possible.
>
>Saying that
>ident-type =  "ppt" EQUAL ( token / ( DQUOTE token DQUOTE ) )
>leaves no room for misinterpretation.
>
>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.

Regards,

Christer