# File lib/ovirt/volume.rb, line 12
    def self.to_xml(storage_domain_id,opts={})
       builder = Nokogiri::XML::Builder.new do
        disk_{
          storage_domains_{
            storage_domain_(:id => storage_domain_id)
          }
          size_(opts[:size] || 8589934592)
          type_(opts[:type] || 'system')
          bootable_(opts[:bootable] || 'true')
          interface_(opts[:interface] || 'virtio')
          format_(opts[:format] || 'cow')
          sparse_(opts[:sparse] || 'true')
        }
      end
      Nokogiri::XML(builder.to_xml).root.to_s
    end