I would split my bibliography file in two and use the multiple-bibliographies filter. That's a sometimes irritating limitation of CSL: you can check if a variable is set, but not test its value.

Le Friday 08 September 2023 à 11:17:57AM, 'William Lupton' via pandoc-discuss a écrit :
> Hello,
>
> I'd like to sort references so a given publisher's ("BBF") references are
> listed first, and am wondering whether it's possible to compare the publisher
> variable with "BBF". I tried, but it doesn't seem to work (and the CSL spec.
> doesn't appear to indicate that you can do this), so I've fallen back on using
> original-publisher (I'll have to make sure that all the BBF references use this
> rather than publisher). This works, but I'd prefer the first approach. Any
> suggestions?
>
> CSL is attached.
>
> Thanks,
> William
>
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