code: def dumps_xml(props, comment=None, sort_keys=False):
      
      return ''.join(s + '\n' for s in _stream_xml(props, comment, sort_keys))
docs: Convert a series ``props`` of key-value pairs to a text string containing
      an XML properties document.  The document will include a doctype
      declaration but not an XML declaration.
  
      :param props: A mapping or iterable of ``(key, value)`` pairs to serialize.
          All keys and values in ``props`` must be text strings.  If
          ``sort_keys`` is `False`, the entries are output in iteration order.
      :param comment: if non-`None`, ``comment`` will be output as a
          ``<comment>`` element before the ``<entry>`` elements
      :type comment: text string or `None`
      :param bool sort_keys: if true, the elements of ``props`` are sorted
          lexicographically by key in the output
      :rtype: text string