I have a small text file in markdown :

```
---
title: postWithReference
author: auf
date: 2010-07-29
keywords: homepage
abstract: |
    What are the objects of
    ontologists .

bibliography: "/home/frank/Workspace8/SSG/site/resources/BibTexLatex.bib"
csl: "/home/frank/Workspace8/SSG/site/resources/chicago-fullnote-bibliography-bb.csl"
---

An example post. With a reference to [@Frank2010a] and more[@navratil08].

## References

```

and process it in Haskell with `processCites'` which has a single argument, namely the `Pandoc` data resulting from `readMarkdown`. The bibliography and the csl style should be taken from the input file. 

The process does not produce errors, but the result of `processCites` is the same text as the input; references are not treated at all. For the same input the references are resolved with the standalone pandoc (this excludes errors in the bibliography and the csl style)

```
pandoc -f markdown -t html  --filter=pandoc-citeproc -o p1.html postWithReference.md 

```

The issue is therefore in the API. The code I have is:

```
markdownToHTML4 :: Text -> PandocIO Value
markdownToHTML4 t = do
  pandoc   <- readMarkdown markdownOptions  t
  let meta2 = flattenMeta (getMeta pandoc)

  -- test if biblio is present and apply 
  let bib = Just $ ( meta2) ^? key "bibliography" . _String
  pandoc2 <- case bib of
    Nothing -> return pandoc
    _ -> do
                res <- liftIO $ processCites' pandoc --  :: Pandoc -> IO Pandoc
                when (res == pandoc) $ 
                    liftIO $ putStrLn "*** markdownToHTML3 result without references ***" 
                return res

  htmltex <- writeHtml5String html5Options pandoc2

  let withContent = ( meta2) & _Object . at "contentHtml" ?~ String ( htmltex)
  return  withContent

getMeta :: Pandoc -> Meta
getMeta (Pandoc m _) = m

```

What do I misunderstand? are there any reader options necessary for citeproc? The bibliography is a BibLatex file.

I found in hakyll [code](https://jaspervdj.be/hakyll/reference/src/Hakyll-Web-Pandoc-Biblio.html) a comment, which I cannot understand in light of the code there - perhaps somebody knows what the intention is. 

```
-- We need to know the citation keys, add then *before* actually parsing the
-- actual page. If we don't do this, pandoc won't even consider them
-- citations!

```