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Re: [rfc-i] What do do about SVG

Brian E Carpenter <brian.e.carpenter@gmail.com> Tue, 15 December 2020 22:51 UTC

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To: "John R. Levine" <johnl@iecc.com>, RFC Interest <rfc-interest@rfc-editor.org>
References: <f564019-d8b1-76c2-2768-c135d834dc32@iecc.com>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Message-ID: <763b8195-6139-fb20-aa4e-2b4d89b5681c@gmail.com>
Date: Wed, 16 Dec 2020 11:51:04 +1300
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Subject: Re: [rfc-i] What do do about SVG
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On 16-Dec-20 08:47, John R. Levine wrote:
...
> Assuming that one of the goals is to have good tool support, what SVG 
> tools do people use and what profiles do they support?

Yes, indeed the problem is that people need to use a drawing tool
and as far as I can see, none of the drawing tools I've tried
support a TinySVG profile, let alone the RFC7996 subset of it.

I have used (at least) the following:
LibreOffice
dia
a web site for drawing Venn diagrams (http://bioinformatics.psb.ugent.be/webtools/Venn/)

and fed the results through svgcheck and some additional hacks
of my own, plus manual editing of the SVG file (which is of
course just a dialect of XML).

The kind of problems that I've encountered are that even if you
manage to avoid colour or greyscale, lots of other things that
are disallowed by RFC7996 show up and svgcheck cannot fix them.
Yet the SVG can be rendered by every browser I've tried. So while
we have good reasons for some restrictions, I don't think we
get anything but hassle from the TinySVG restrictions.

Restrictions we do need, IMHO, include
- no colour
- no greyscale
- no scripting
- no external URLs
- use viewbox and *no* height/width, to allow proper scaling

but we shouldn't waste everybody's time by worrying about
SVG syntax in general.

(If there was some SVG equivalent of PDF-A, that would be
fine, but there isn't, to my knowledge.)

    Brian
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