Comment 9 for bug 1553211

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Amr Ibrahim (amribrahim1987) wrote : Re: gnome-software does not treat recommends and suggests as plugins to applications | impossible to install "technical" packages (plugins, kernels...)

Thanks Matthias. Now I understand. So a package like gimp-data-extras (which gimp suggests in Debian) needs to have a metainfo file defining that this software is an addon which extends the functionality of another software. It's defined here https://www.freedesktop.org/software/appstream/docs/sect-Metadata-Addon.html