text: from typing import Sequence
  
  from lxml import etree
  
  from libvirt_vmcfg.dom.elements.devices import Device
  
  
  class VirtIOSerialController(Device):
      unique: bool = False
  
      def attach_xml(self, root: etree._Element) -> Sequence[etree._Element]:
          devices_tag = self.get_devices_tag(root)
          return [etree.SubElement(devices_tag, "controller",
                                   type="virtio-serial")]
  
      def __repr__(self):
          return f"VirtIOSerialController()"
  