code: def _add_container(props_node, tag, container):
          
          values_node = ElementTree.SubElement(props_node, tag)
          for value in container:
              value_node = ElementTree.SubElement(values_node, TAG_VALUE)
              value_node.text = str(value)
docs: Walks through the given container and fills the node
  
          :param props_node: A property node
          :param tag: Name of the container tag
          :param container: The container