[rfc-i] No, constraining to a custom SVG profile is not trivial
Brian E Carpenter
brian.e.carpenter at gmail.com
Wed Jan 22 18:29:42 PST 2020
On 23-Jan-20 11:29, Donald Eastlake wrote:
> There does exist a system form mapping some colors into cross
> hatchings. See hatchings at
However, I think that realistically we can't expect IETF tooling to perform that complex a remapping (colour to cross-hatching). It really would need to be done with the initial drawing tool.
gnuplot, for example, supports setting monochrome linetypes when plotting multiple variables on a single graph. LibreOffice Draw supports cross-hatching. Unfortunately the SVG that it generates includes a construct (<path style="fill:url(#pattern1)" .../>) that we apparently don't allow, even though it's an internal reference:
>>> The attribute 'fill' does not allow the value 'url(#pattern1)', replaced with 'black'
I know exactly where to patch svgcheck to allow this case through, but it will be a hack.
Not out of the woods yet. SVG-in-RFCs just isn't ready for production use.
> Donald E. Eastlake 3rd +1-508-333-2270 (cell)
> 2386 Panoramic Circle, Apopka, FL 32703 USA
> d3e3e3 at gmail.com
> On Wed, Jan 22, 2020 at 10:58 AM Salz, Rich <rsalz at akamai.com> wrote:
>>> I agree that the lack of coloured shading is annoying for many people, but *using* shading is annoying for people with limited colour vision.
>> Huge agreement here. And further, the number of people who are qualified to set shading properly so that various color-limited people can still see things is small. Probably close to zero percentage of those writing drafts.
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