Thanks, 'read' was the hint I was looking for! It's working now :)
John MacFarlane schrieb am Donnerstag, 9. September 2021 um 19:22:19 UTC+2:

>
> Citations are only recognized when they're parsed as markdown.
> @key in a code block or attribute won't be parsed.
>
> You could use the pandoc Lua 'read' function to parse the
> contents of your attribute as Markdown and then do something with that.
>
> Carsten Gips <cagix...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:
>
> > I've tried to resolve this manually by extracting this piece with a Lua 
> > filter, converting it into a new document and running Pandoc plus 
> Citeproc 
> > on this temporary document with `pandoc.utils.run_json_filter`, 
> retrieving 
> > the processed citation and putting it back as codeblock caption in the 
> > original document. However, this approach seems not to be working.
> >
> > To narrow this down further, I wrote a short document (`test.md`, see 
> > attachment) and a Lua filter (`codecite.lua`, see attachment). (To make 
> it 
> > even shorter, in the Lua filter I simply replace the text block of the 
> > document with a similar new block).
> >
> > But this does not seem to work. The call `pandoc -L codecite.lua test.md 
> -t 
> > json` returns only 
> >
> > ```json
> > 
> {"pandoc-api-version":[1,22],"meta":{"references":{"t":"MetaList","c":[{"t":"MetaMap","c":{"author":{"t":"MetaList","c":[{"t":"MetaMap","c":{"family":{"t":"MetaInlines","c":[{"t":"Str","c":"Wuppie"}]}}}]},"id":{"t":"MetaInlines","c":[{"t":"Str","c":"FOO"}]},"title":{"t":"MetaInlines","c":[{"t":"Str","c":"Lorem"},{"t":"Space"},{"t":"Str","c":"Ipsum"}]}}}]}},"blocks":[{"t":"Para","c":[{"t":"Str","c":"see 
>
> > [@FOO]"}]}]}
> > ```
> > i.e. the citation is not resolved.
> >
> > However, if I run Pandoc directly on this document, i.e `pandoc -t json 
> > --citeproc test.md`, the result is as expected:
> >
> > ```json
> > 
> {"pandoc-api-version":[1,22],"meta":{"references":{"t":"MetaList","c":[{"t":"MetaMap","c":{"author":{"t":"MetaList","c":[{"t":"MetaMap","c":{"family":{"t":"MetaInlines","c":[{"t":"Str","c":"Wuppie"}]}}}]},"id":{"t":"MetaInlines","c":[{"t":"Str","c":"FOO"}]},"title":{"t":"MetaInlines","c":[{"t":"Str","c":"Lorem"},{"t":"Space"},{"t":"Str","c":"Ipsum"}]}}}]}},"blocks":[{"t":"Para","c":[{"t":"Str","c":"see"},{"t":"Space"},{"t":"Cite","c":[[{"citationId":"FOO","citationPrefix":[],"citationSuffix":[],"citationMode":{"t":"NormalCitation"},"citationNoteNum":1,"citationHash":0}],[{"t":"Str","c":"(Wuppie,"},{"t":"Space"},{"t":"Str","c":"n.d.)"}]]}]},{"t":"Div","c":[["refs",["references","csl-bib-body","hanging-indent"],[]],[{"t":"Div","c":[["ref-FOO",["csl-entry"],[]],[{"t":"Para","c":[{"t":"Str","c":"Wuppie."},{"t":"Space"},{"t":"Str","c":"n.d."},{"t":"Space"},{"t":"Span","c":[["",[],[]],[{"t":"Str","c":"“"},{"t":"Str","c":"Lorem"},{"t":"Space"},{"t":"Str","c":"Ipsum"},{"t":"Str","c":"."},{"t":"Str","c":"”"}]]}]}]]}]]}]}
> > ```
> >
> > Clearly I'm missing something here. But what is it? Can you please 
> advise?
> >
> >
> > PS: `pandoc --version`: pandoc 2.14.2
> >
> > Carsten Gips schrieb am Donnerstag, 9. September 2021 um 10:27:36 UTC+2:
> >
> >> Dear all,
> >>
> >> I'm trying to resolve citations inside attributes, i.e. 
> >>
> >> ```{.c caption="nice, see [@KEY]"}
> >> ...
> >> ```
> >>
> >> Pandoc and Citeproc are currently not handling citations inside am 
> >> attribute like in the example. How can I resolve these citations anyway?
> >>
> >> Thanks,
> >> Carsten
> >>
> >
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> .
> > ---
> > references:
> > - author:
> > - family: Wuppie
> > id: FOO
> > title: Lorem Ipsum
> > ---
> > see [@FOO]
>

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