I think you need to include the `@` explicitly:

$for(references)$
[@$it.id$]: $it.url$
$endfor$

-- 
Better --help|less than helpless

Den tis 15 dec. 2020 21:21John MacFarlane <jgm-TVLZxgkOlNX2fBVCVOL8/A@public.gmane.org> skrev:

>
> Just create a tool that produces a list like this, for
> the items in your database:
>
> [@Smith2020]: https://example.com/whatever
> [@Joens2020]: https://google.com/whatever
> ...
>
> Then pass the file to pandoc after your main markdown
> file.
>
> How, then, to create the list?
>
> I think it could be done using pandoc's templating system,
> if you have the bibliography in YAML form.
>
> Use a template like
>
> $for(references)$
> [$it.id$]: $it.url$
> $endfor$
>
>
> Joseph Reagle <joseph.2011-T1oY19WcHSwdnm+yROfE0A@public.gmane.org> writes:
>
> > I sometimes find myself writing for a popular venue where citations
> aren't welcome but links are. If @Smith2020 has a URL associated with it in
> the citation database, it'd be cool to do something like:
> >
> > You should really read [the excellent book][@Smith] from earlier in the
> year.
> >
> > Anyone have any ideas for achieving something like this?
> >
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