<devices>
     <emulator>/usr/lib/xen/bin/qemu-dm</emulator>
     <disk type="block" device="floppy">
-      <source dev="/dev/null"/>
       <target dev="fda" bus="fdc"/>
-      <boot order="5"/>
+      <boot order="6"/>
       <address type="drive" controller="0" bus="0" target="0" unit="0"/>
+      <fakeelement/>
     </disk>
     <disk type="file" device="disk">
       <source file="/tmp/foobar"/>

Domain 'test-for-virtxml' defined successfully.
Changes will take effect after the domain is fully powered off.