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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