Re: All numeric heading identifiers

[John MacFarlane <jgm-TVLZxgkOlNX2fBVCVOL8/A@public.gmane.org>]

When the attribute syntax was introduced, the decision was made
to require that identifiers start with a letter.  That is
required for both HTML4 and XML -- and hence for XHTML5,
which we aim for in HTML output (so that this output is
"polyglot," and also so that it can be used in EPUB3, which
requires XHTML5).

This applies both to autogenerated and explicitly given ids.

"andreas....-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org" <andreas.schamanek-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:

> I read the sections Heading Identifiers and Extension: auto_identifiers 
> <https://pandoc.org/MANUAL.html#extension-auto_identifiers> in the manual. 
> So, I think I understand why the following produces `id="section"`
>
> $ printf '# 47\n' | pandoc
> <h1 id="section">47</h1>
>
> But why is it that I cannot make Pandoc use a specific identifier like in
>
> $ printf '# 47 {#47}\n' | pandoc 
> <h1 id="section">47 {#47}</h1>
>
> I expected Pandoc to produce `id="47"`.
>
> BTW, I came upon this because I was wondering how to reference ISO dates in 
> headers, like
>
> ## 2021-08-29
>
> because
>
> ## 2021-08-29 {#2021-08-29}
>
> produces `id="section"` too.
>
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