That's what I'm currently using :). It's assigned the values 1, 2, 3 etc.
as citations are encountered (please see my example). Thanks, W.

On Fri, 21 Jan 2022 at 17:37, Bastien DUMONT <bastien.dumont-VwIFZPTo/vqsTnJN9+BGXg@public.gmane.org>
wrote:

> I have not tested, but does the CSL 'citation-number' variable address
> your need?
> https://docs.citationstyles.org/en/v1.0.2/specification.html#toc-entry-92
>
> Le Friday 21 January 2022 à 04:36:56PM, William Lupton a écrit :
> > All,
> >
> > I've been using citation-number to label and sort citations, which means
> that
> > citations are presented in the order in which they were cited.
> >
> > I'd prefer to have citations sorted by call-number but still labeled 1,
> 2, 3...
> > However, I can't see how to do this: it would apparently require a
> numeric
> > variable that corresponds to the sorted order (regardless of sort key).
> >
> > (It seems that, if this isn't possible using standard CSL, it could be
> > addressed by asking citeproc to support a non-standard 'sorted-number'
> (or
> > similar) variable.)
> >
> > Any ideas?
> >
> > Thanks,
> > William
> >
> > ---- example ----
> >
> > With the markdown shown below, my CSL (which I could supply) gives this
> > (citations sorted by order of reference):
> >
> > [1]    RFC 2549, IP over Avian Carriers with Quality of Service, IETF,
> 1999
> > [2]    RFC 1149, Avian Carriers, IETF, 1990
> >
> > ...but I'd like this (citations sorted by call-number):
> >
> > [1]    RFC 1149, Avian Carriers, IETF, 1990
> > [2]    RFC 2549, IP over Avian Carriers with Quality of Service, IETF,
> 1999
> >
> > ---
> > title: Reference order illustration
> >
> > references:
> > - id: RFC1149
> >   call-number: RFC 1149
> >   title: Avian Carriers
> >   publisher: IETF
> >   issued: {year: 1990}
> >
> > - id: RFC2549
> >   call-number: RFC 2549
> >   title: IP over Avian Carriers with Quality of Service
> >   publisher: IETF
> >   issued: {year: 1999}
> > ...
> >
> > # Text
> >
> > This is RFC 2549 [@RFC2549].
> >
> > This is RFC 1149 [@RFC1149].
> >
> > # References
> >
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> > [2]
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