All numeric heading identifiers

All numeric heading identifiers

[andreas....-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org]

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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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Re: All numeric heading identifiers

['Saku Laesvuori' via pandoc-discuss]

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> 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"`.

As a workaround you can write '# 123 {id=123}\n' but not being able to
use the #-syntax seems like a bug to me.

Re: All numeric heading identifiers

[William Lupton]

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One of the steps in the auto_identifiers algorithm is:


   - Remove everything up to the first letter (identifiers may not begin
   with a number or punctuation mark).


On Sun, 29 Aug 2021, 18:56 'Saku Laesvuori' via pandoc-discuss, <
pandoc-discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org> wrote:

> > 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"`.
>
> As a workaround you can write '# 123 {id=123}\n' but not being able to
> use the #-syntax seems like a bug to me.
>
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> .
>

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Re: All numeric heading identifiers

[John MacFarlane]

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.
>
> -- 
> You received this message because you are subscribed to the Google Groups "pandoc-discuss" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to pandoc-discuss+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
> To view this discussion on the web visit https://groups.google.com/d/msgid/pandoc-discuss/70061a93-5913-4668-8bac-3bdaedb9c710n%40googlegroups.com.

Re: All numeric heading identifiers

[andreas....-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org]

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On Monday, August 30, 2021 at 4:06:34 AM UTC+2 John MacFarlane wrote:

>
> When the attribute syntax was introduced, the decision was made 
> to require that identifiers start with a letter. (…)
> This applies both to autogenerated and explicitly given ids. 
>

Thanks for clarifying this.

Thanks @Saku Laesvuori for the workaround using `{id=123}`.

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