Thanks for pointing out the addition of `pandoc.utils.references`. It's 
definitely useful. I'll have to look into it the next time I want to do 
something special with citations.

I have twice wanted to be able to distinguish individual citations in 
`Cite`'s inlines. Once was for the purpose of spell checking. When I cite 
sources in multiple languages, I need multi-lingual spell checking. So, in 
addition to the document that I will submit, I make ODT with the languages 
tagged so that I can spell check in LibreOffice. To spell check the 
citations, they need to be appropriately tagged. Because each bibliography 
entry has an ID derived from its bibliography key, I can identify them and 
give them an appropriate `lang` attribute. But in footnotes, it's not clear 
where one citation ends and the next begins, so I can't add a lang 
attribute in general. Even if there's just one citation, it could have a 
prefix or suffix in the document language. For this, perhaps I could use 
`pandoc.utils.references`, tag the principal parts of the citation with the 
reference's language, and save the resulting references in the `Pandoc` 
element for citeproc.

The second application was for a journal that uses idem instead of 
repeating author names. When I decided that an automatic solution was not 
practical, I solved the problem manually for the few citations that needed 
idem. For this, I would need too be able to identify not only individual 
citations, but also the author part of the citation. However, knowing my 
CSL style, I could assume that the author is the first element in the 
citation proper (after the prefix), or the series of elements that ends 
with `SmallCaps`.
On Monday, May 30, 2022 at 3:35:06 PM UTC+2 Albert Krewinkel wrote:

>
> Shane Liesegang <lies...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:
>
> > What would be truly ideal would be the ability to filter the
> > citation process itself, but I'm assuming since that's from a
> > different library that it is not exposed to Lua? Like I said, I
> > have something mostly working now, but any thoughts/advice would
> > be appreciated.
>
> The closest thing is probably the `pandoc.utils.references`
> function (added in pandoc 2.17). It gives you access to the
> structured reference entries. Theoretically one could write a
> custom citation handler by using that function and filtering
> `Cite` elements; it might or might not be worth the effort in your
> case.
>
> HTH,
>
> Albert
>
>
> -- 
> Albert Krewinkel
> GPG: 8eed e3e2 e8c5 6f18 81fe e836 388d c0b2 1f63 1124
>

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