Hello Julien.

> The name implies this is a plugin for maven. The way you build it,
> maven will not be able to use it because it's missing some metadata.

Okay.  I moved the package to (gnu packages maven) as it seems to be
the more appropriate place for Maven plugins indeed.

> You can use generate-plugin.xml to generate the required file. The
> parser might not work properly, I'll have a look if it doesn't work, but
> that might take some time.

Thanks for the hint, I modified the patch so now the package uses
"generate-plugin.xml".

Please find the new patch attached.