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Re: [netmod] WGLC on draft-ietf-netmod-rfc6991-bis-11

Carsten Bormann <cabo@tzi.org> Mon, 27 June 2022 15:57 UTC

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From: Carsten Bormann <cabo@tzi.org>
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Date: Mon, 27 Jun 2022 17:57:35 +0200
Cc: tom petch <ietfc@btconnect.com>, "netmod@ietf.org" <netmod@ietf.org>
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To: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
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Subject: Re: [netmod] WGLC on draft-ietf-netmod-rfc6991-bis-11
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On 2022-06-27, at 16:08, Jürgen Schönwälder <j.schoenwaelder@jacobs-university.de> wrote:
> 
> Petterns are nice to have to detect wrong values "early" but once
> patterns become very complex, the likelihood increases that they are
> wrong.

We (draft-ietf-core-problem-details) had a grammar mirroring RFC 5646 first but then came up with (CDDL):

tag38-ltag = text .regexp "[a-zA-Z]{1,8}(-[a-zA-Z0-9]{1,8})*"

based on input that the XML documents have been doing the same for a couple of decades already.

JFYI.

Grüße, Carsten

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