Description of problem:
7.2. Adding storage devices to guests;

Step 2 of adding file based storage

$ sudo virsh xmldump Guest1 > ~/Guest1.xml

which should be 

$ sudo virsh dumpxml Guest1 > ~/Guest1.xml

Actual results:

# virsh xmldump rhel5.3 > ~/rhel5.3.xml
error: unknown command: 'xmldump'

# virsh dumpxml rhel5.3 > ~/rhel5.3.xml
 
Also, Step 3 and 4 of adding file based storage reflect the xen guest file and not xml

disk = [ 'tap:aio:/var/lib/xen/images/Guest1.dsk,xvda,w' ] TODO

should be 

    <disk type='file' device='disk'>
      <driver name='tap' type='aio'/>
      <source file='/var/lib/libvirt/images/rhel5.3.img'/>
      <target dev='xvda'/>
    </disk>