Packages_dom0

Environment Group: Qubes OS with Xfce
 Description: Standard installation with Xfce enviroment in Dom0.
 Mandatory Groups:
   Base
   Extra plugins for the Xfce panel
   Fonts
   Hardware Support
   Multimedia support for Xfce
   Qubes Environment
   Sound basic support
   X Window System
   Xfce
 Optional Groups:
   Debian 9 (stretch) template
   Whonix

Group: Qubes Environment
 Mandatory Packages:
   kernel
   kernel-qubes-vm
   qubes-artwork
   qubes-core-dom0
   qubes-desktop-linux-common
   qubes-desktop-linux-manager
   qubes-gui-dom0
   qubes-mgmt-salt-dom0
   qubes-template-fedora-29
 Default Packages:
   libvirt-client
   qubes-gpg-split-dom0
   qubes-img-converter-dom0
   qubes-input-proxy
   qubes-pdf-converter-dom0
   qubes-usb-proxy-dom0

Check builder/qubes-src/installer-qubes-os/qubes-release/comps-qubes.xml

Explicitly state package list?
 Base
 Extra plugins for the Xfce panel
 Fonts
 Hardware Support
 Multimedia support for Xfce
 Sound basic support
 X Window System
 Xfce
 kernel
 kernel-qubes-vm
 qubes-artwork
 qubes-core-dom0
 qubes-desktop-linux-common
 qubes-desktop-linux-manager
 qubes-gui-dom0
 qubes-mgmt-salt-dom0
 libvirt-client
 qubes-gpg-split-dom0
 qubes-img-converter-dom0
 qubes-input-proxy
 qubes-pdf-converter-dom0
 qubes-usb-proxy-dom0
 Debian 9 (stretch) template