:param key_xml: lxml.etree.Element representing a single VocabularyCodeSet

def parse_xml(self, xml):
        '''
            :param key_xml: lxml.etree.Element representing a single VocabularyCodeSet
        '''
        xmlutils = XmlUtils(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')
        for item in xml.xpath('code-item'):
            self.code_item.append(VocabularyCodeItem(item))
        self.is_vocab_truncated = xmlutils.get_bool_by_xpath('is-vocab-truncated')
        self.language = xmlutils.get_lang()