@probonopd
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When converting this input file

...
    <screenshots>
        <screenshot type="default">http://images.videolan.org/vlc/screenshots/2.0.0/vlc-2.0-poney.jpg</screenshot>
        <screenshot type="default">http://images.videolan.org/vlc/screenshots/2.0.0/vlc-2.0-gnome3-open.jpg</screenshot>
        <screenshot type="default">http://images.videolan.org/vlc/screenshots/2.0.0/vlc-2.0-gnome3-debian.jpg</screenshot>
    </screenshots>
</component>

then I get this output file

...
Screenshots:
- default: true
  thumbnails: []
- default: true
  thumbnails: []
- default: true
thumbnails: []

me@host:~$ ./appstreamcli-x86_64.AppImage --version
AppStream CLI tool version: 0.11.4