Hints for xball in universe

xball ⚙ amd64

asv-cid-desktopapp-is-not-rdns
xball.metainfo.xml:4 - xball
The component ID is not a reverse domain-name. Please update the ID to avoid future issues and be compatible with all AppStream implementations. You may also consider to update the name of the accompanying .desktop file to follow the latest version of the Desktop-Entry specification and use a rDNS name for it as well. In any case, do not forget to mention the new desktop-entry in a <launchable/> tag for this component to keep the application launchable from software centers and the .desktop file data associated with the metainfo data.
asv-screenshot-no-media
xball.metainfo.xml:37 -
A screenshot must contain at least one image or video in order to be useful. Please add an <image/> to it.

asv-developer-name-tag-deprecated
xball.metainfo.xml:35 -
The toplevel `developer_name` element is deprecated. Please use the `name` element in a `developer` block instead.
asv-developer-info-missing
xball.metainfo.xml -
This component contains no `developer` element with information about its author.
screenshot-no-thumbnails
No thumbnails have been generated for screenshot 'https://screenshots.debian.net/shrine/screenshot/8154/simage/thumb-d5b1a6d95759fdf917ba37251d9d98cc.png'.
This could mean that the original provided screenshot is too small to generate thumbnails from.