[xml2rfc] xml:space in v3.rnc (Re: Insufficiency of txt format)
Carsten Bormann <cabo@tzi.org> Mon, 01 February 2021 17:41 UTC
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From: Carsten Bormann <cabo@tzi.org>
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Date: Mon, 01 Feb 2021 18:41:02 +0100
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Subject: [xml2rfc] xml:space in v3.rnc (Re: Insufficiency of txt format)
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On 2021-02-01, at 18:21, Carsten Bormann <cabo@tzi.org> wrote: > > white-space handling And while we are talking about this: What the [insert Unicode characters here] is the story behind the two occurrences of xml:space in v3.rnc. spanx = element spanx { […] [ a:defaultValue = "preserve" ] attribute xml:space { "default" | "preserve" }?, So, for a (legacy) <spanx> specifically, xml:space defaults to “preserve”. For artwork: artwork = element artwork { […] attribute xml:space { text }?, … it is allowed to set xml:space to any value (invalid in XML), but there is no default. Also, xml:space is not allowed for <sourcecode>. Contrast this to v2.rnc: spanx = element spanx { [ a:defaultValue = "preserve" ] attribute xml:space { "default" | "preserve" }?, So this is unchanged in v3 from v2. artwork = element artwork { [ a:defaultValue = "preserve" ] attribute xml:space { "default" | "preserve" }?, … makes sense if you think that xml:space is going to be useful at all. This was discussed in <https://mailarchive.ietf.org/arch/msg/xml2rfc-dev/U7ounlQdYz95U3I-PofVgheYmPI>, but apart from agreeing that xml:space is useless, not much light has been generated. There are a few more mentions further in history that I can find, but none of them really discussed how the situation of just <spanx> and <artwork> using xml:space and the v3 weirdness around this occurred. RFC 7991 says: o Deprecate the "xml:space" attribute in <artwork> because there was only one useful value. […] … and dutifully notes the above change in the RNC diff. Er, since only one value is useful, we allow any value and then let the default lapse to the non-useful one? Most likely, there is no reason (because nothing actually is using this attribute), so this can be cleaned up, but I sure would like to know if there is. Should an authoring tool generate any of these? (There is also the SVG issue, which I’ll pass now.) Grüße, Carsten
- [xml2rfc] Unicode box-drawing for a new --table-b… Daniel Kahn Gillmor
- Re: [xml2rfc] [xml2rfc-dev] Unicode box-drawing f… Lars Eggert
- Re: [xml2rfc] Unicode box-drawing for a new --tab… John Levine
- Re: [xml2rfc] [xml2rfc-dev] Unicode box-drawing f… John Levine
- Re: [xml2rfc] Unicode box-drawing for a new --tab… Tom Pusateri
- Re: [xml2rfc] Unicode box-drawing for a new --tab… John R Levine
- Re: [xml2rfc] Unicode box-drawing for a new --tab… Daniel Kahn Gillmor
- Re: [xml2rfc] Unicode box-drawing for a new --tab… Julian Reschke
- Re: [xml2rfc] Unicode box-drawing for a new --tab… Anders Rundgren
- Re: [xml2rfc] Unicode box-drawing for a new --tab… John R Levine
- Re: [xml2rfc] Unicode box-drawing for a new --tab… Carsten Bormann
- Re: [xml2rfc] Unicode box-drawing for a new --tab… Carsten Bormann
- Re: [xml2rfc] Unicode box-drawing for a new --tab… John R Levine
- Re: [xml2rfc] Insufficiency of txt format Paul Kyzivat
- Re: [xml2rfc] Insufficiency of txt format John Levine
- Re: [xml2rfc] [xml2rfc-dev] Unicode box-drawing f… Lars Eggert
- Re: [xml2rfc] [xml2rfc-dev] Unicode box-drawing f… Daniel Kahn Gillmor
- Re: [xml2rfc] [xml2rfc-dev] Unicode box-drawing f… Lars Eggert
- Re: [xml2rfc] [xml2rfc-dev] Unicode box-drawing f… Carsten Bormann
- Re: [xml2rfc] Insufficiency of txt format Paul Kyzivat
- Re: [xml2rfc] Insufficiency of txt format Carsten Bormann
- [xml2rfc] xml:space in v3.rnc (Re: Insufficiency … Carsten Bormann
- Re: [xml2rfc] xml:space in v3.rnc (Re: Insufficie… Julian Reschke
- Re: [xml2rfc] Unicode box-drawing for a new --tab… Daniel Kahn Gillmor