In version v0.2.306, and earlier, it was legal, and effective, to give a list for the `bibliography` entry in `_quarto.yml`, e.g.:

```
bibliography: [refs1.bib, refs2.bib]
```

In current main, which is v0.2.346, I get this error on `quarto render`:

```
ERROR: Project _quarto.yml validation failed.
(line 12, columns 15--37): Field /bibliography must be a string
11: 
12: bibliography: [refs1.bib, refs2.bib]
                  ^^^^^^^^^^^^^^^^^^^^^^
13: 
ERROR: Error: Project _quarto.yml validation failed.
```

See: https://github.com/matthew-brett/mysite

I do find it useful to use more than one bibliography in that entry, and it is allowed in standard Pandoc.  Could the validation be relaxed or modified to allow this?
2021-12-11T20:41:20Z
matthew-brett
closed
Quarto now disallows lists for bibliography field.
https://github.com/quarto-dev/quarto-cli/issues/213