[Users] API usage - 3.1

Trying to get going adding VM's via the API and so far have managed to get quite far - I am however facing this vm_template = """<vm> <name>%s</name> <cluster> <name>Default</name> </cluster> <template> <name>Blank</name> </template> <vm_type>server</vm_type> <memory>536870912</memory> <os> <boot dev="hd"/> </os> </vm>""" The VM is created but the type ends up being a desktop and not a server - What did i do wrong? thanks