I think this is deal with appstream-data package ,

https://apps.fedoraproject.org/packages/appstream-data/


On Wed, 2017-08-02 at 13:01 +0000, Vascom wrote:
Hi.

I have some packages in main fedora repo with appdata.xml files but can't find them in gnome-software.
How do programs get into the Software Center and become visible before they are installed?
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Sérgio M. B.