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Re: [Cbor] Multiple questions with CBOR for DNS

Carsten Bormann <cabo@tzi.org> Thu, 09 November 2023 15:25 UTC

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From: Carsten Bormann <cabo@tzi.org>
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Date: Thu, 09 Nov 2023 16:25:08 +0100
Cc: Esko Dijk <esko.dijk@iotconsultancy.nl>, "cbor@ietf.org" <cbor@ietf.org>, "draft-lenders-dns-cbor.authors@ietf.org" <draft-lenders-dns-cbor.authors@ietf.org>
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Subject: Re: [Cbor] Multiple questions with CBOR for DNS
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How about:

question-section = [
  * full-question, 
  ? last-question
]

    full-question = (
      name: domain-name,
      type-spec,
    )

    last-question = (
      name: domain-name,
      ? type-spec,
    )

It is a bit hard in this form to maintain the requirement for at least one question, because if the last question is also a full question, it will be gobbled up by the `* question` part.
(An intersection would work, but requires two parsing threads.)

> In the current draft, it is not, but if we go for the name component route, it will become hard to distinguish between the name for a second question or another component of the name for the first. Just necessitating at least a type in-between the names would help with that

Grüße, Carsten

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