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asv-cid-desktopapp-is-not-rdns
exaile.appdata.xml:3 - exaile.desktop
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
exaile.appdata.xml:88 -
A screenshot must contain at least one image or video in order to be useful. Please add an <image/> to it.

asv-id-tag-has-type
exaile.appdata.xml:3 - exaile.desktop
The <id/> tag still contains a `type` property, probably from an old conversion to the recent metainfo format.
asv-unknown-tag
exaile.appdata.xml:91 - updatecontact
Found invalid tag. Non-standard tags should be prefixed with `x-`. AppStream also provides the <custom/> tag to add arbitrary custom data to metainfo files. This tag is read by AppStream libraries and may be useful instead of defining new custom toplevel or `x-`-prefixed tags if you just want to add custom data to a metainfo file.
asv-developer-info-missing
exaile.appdata.xml -
This component contains no `developer` element with information about its author.