Possible values for the <code>sstVirtualMachineMode</code> attribute are:
* '''do not use''': virtual machines can not be created from this virtual machine template. Meaning an undefined stateand the administrator must look into the situation.
* '''maintenance mode''': virtual machines can not be created from this virtual machine template. This mode is used to update the virtual machine template.
* '''first installation''': virtual machines can not be created from this virtual machine template, this is the default mode after a fresh virtual machine template creation.