<?xml version="1.0" encoding="utf-8"?> <rougail version="0.10"> <variables> <variable name='name' description="Machine name" type="domainname" hidden="True"/> <variable name='data_disk_size' description="Data disk size" type="number"/> </variables> <constraints> <fill name="calc_value"> <param type="variable">domain_name_eth0</param> <target>machine.name</target> </fill> </constraints> </rougail>