docs: def parse_xml(self, key_xml):
          '''
              Parse a VocabularyKey from an Xml as per Healthvault
              schema.
  
              :param key_xml: lxml.etree.Element representing a single VocabularyKey
          '''
          xmlutils = XmlUtils(key_xml)
          self.name = xmlutils.get_string_by_xpath('name')
          self.family = xmlutils.get_string_by_xpath('family')
          self.version = xmlutils.get_string_by_xpath('version')
          self.description = xmlutils.get_string_by_xpath('description')
  
          self.language = xmlutils.get_lang()