I wrote couple articles about how to create and delete vDS VXLAN networks using vCO
http://v-reality.info/2013/04/provisioning-vds-vxlan-virtual-wires-using-vcenter-orchestrator/
http://v-reality.info/2013/04/removing-vxlan-virtual-wires-using-vcenter-orchestrator/
Articles also include some examples on how to work with XML data.