Mandatory keys for \DocumentMetadata

[Ulrike Fischer]

Am Wed, 19 Feb 2025 14:15:16 +0100 schrieb Bruno Voisin via
tex-live:


> This works, but testing TL 2025 I'm now getting a warning
> 
> 	LaTeX DocumentMetadata Warning: The language has not been set in
> 	(DocumentMetadata)              \DocumentMetadata.
> 	(DocumentMetadata)              Setting it to 'en' as fallback.
> 
> The warning is suppressed by writing
> 
> 	\DocumentMetadata{lang=en}
> 
> It's harmless, but the less warnings the better, 
> so you can concentrate on actual errors in the TeX log.
> 
> I did not find an explicit mention that \DocumentMetadata is expected to hold at least a lang setting, so that its absence triggers a warning.
>
> 
> lang seems to be the only such "mandatory" key. Is this referenced somewhere in the LaTeX doc?

Well you only get a warning, so it is not mandatory. ;-)

The main reason that is a warning is that I would like to see more
packages to pick up the main language from the MetaData, but that
will only happen if user actually start to set the main language
there. 

See also 
https://tex.stackexchange.com/questions/720459

But the warning is under discussion and perhaps it will disappear
again (at least if it is "en"). 

-- 
Ulrike Fischer 
http://www.troubleshooting-tex.de/