docs: def str_to_etree(xml_str, encoding='utf-8'):
      """Deserialize API XML doc to an ElementTree.
  
      Args:
        xml_str: bytes
          DataONE API XML doc
  
        encoding: str
          Decoder to use when converting the XML doc ``bytes`` to a Unicode str.
  
      Returns:
        ElementTree: Matching the API version of the XML doc.
  
      """
      parser = xml.etree.ElementTree.XMLParser(encoding=encoding)
      return xml.etree.ElementTree.fromstring(xml_str, parser=parser)