def self.write_one(object, writer, singular = nil)
singular ||= 'external_vm_import'
writer.write_start(singular)
href = object.href
writer.write_attribute('href', href) unless href.nil?
Writer.write_string(writer, 'name', object.name) unless object.name.nil?
Writer.write_string(writer, 'password', object.password) unless object.password.nil?
Writer.write_string(writer, 'provider', object.provider) unless object.provider.nil?
Writer.write_boolean(writer, 'sparse', object.sparse) unless object.sparse.nil?
Writer.write_string(writer, 'url', object.url) unless object.url.nil?
Writer.write_string(writer, 'username', object.username) unless object.username.nil?
ClusterWriter.write_one(object.cluster, writer, 'cluster') unless object.cluster.nil?
CpuProfileWriter.write_one(object.cpu_profile, writer, 'cpu_profile') unless object.cpu_profile.nil?
FileWriter.write_one(object.drivers_iso, writer, 'drivers_iso') unless object.drivers_iso.nil?
HostWriter.write_one(object.host, writer, 'host') unless object.host.nil?
QuotaWriter.write_one(object.quota, writer, 'quota') unless object.quota.nil?
StorageDomainWriter.write_one(object.storage_domain, writer, 'storage_domain') unless object.storage_domain.nil?
VmWriter.write_one(object.vm, writer, 'vm') unless object.vm.nil?
writer.write_end
end