How to use the owslib.util.xml_to_dict function in OWSLib

def parse_location(self,xml=None):
        if xml is not None:
            try:
                self._root = etree.parse(xml)
            except:
                self._root = xml

        # try:
        xml_dict = _xml_to_dict(self._root)
        geogs = self._findall('geogLocation')
        self.geo_coords = list()
        self.srs = list()
        for g in geogs:
            self.geo_coords.append((testXMLValue(g.find(ns(self._ns) + 'longitude')),testXMLValue(g.find(ns(self._ns) + 'latitude'))))
            self.srs.append(g.attrib.get('srs'))

        locsite = self._findall('localSiteXY')
        self.local_sites = list()
        self.notes = list()
        self.projections = list()
        for ls in locsite:
            z = testXMLValue(ls.find(ns(self._ns) + 'Z'))
            if z is not None:
                self.local_sites.append((testXMLValue(ls.find(ns(self._ns) + 'X')),testXMLValue(ls.find(ns(self._ns) + 'Y')),z))
            else:

def parse_query_info(self, xml=None):
        if xml is not None:
            try:
                self._root = etree.parse(xml)
            except:
                self._root = xml

        # try:
            # create queryinfo object from dict
        xml_dict = _xml_to_dict(self._root)
        self.creation_time = parser.parse(xml_dict.get('creation_time')) if xml_dict.get('creation_time') is not None else None
        self.notes = [testXMLValue(note) for note in self._findall('note')]
        self.criteria = Criteria(self._find('criteria'), self._ns)
        # except:

def parse_variable(self,xml=None):
        if xml is not None:
            try:
                self._root = etree.parse(xml)
            except:
                self._root = xml

        # try:
        xml_dict = _xml_to_dict(self._root)
        self.value_type = xml_dict.get('value_type')
        self.data_type = xml_dict.get('data_type')
        self.general_category = xml_dict.get('general_category')
        self.sample_medium = xml_dict.get('sample_medium')
        self.no_data_value = xml_dict.get('no_data_value')
        self.variable_name = xml_dict.get('variable_name')
        self.variable_code = xml_dict.get('variable_code')
        self.variable_description = xml_dict.get('variable_description')
        self.speciation = xml_dict.get('speciation')
        # notes and properties
        notes = [(note.attrib.get('title'),testXMLValue(note)) for note in self._findall('note')]
        none_notes = [note[1] for note in notes if note[0] is None]
        self.notes = dict([note for note in notes if note[0] is not None])
        if len(none_notes) > 0:
            self.notes['none'] = none_notes

def parse_criteria(self, xml=None):
        if xml is not None:
            try:
                self._root = etree.parse(xml)
            except:
                self._root = xml

        # try:
        xml_dict = _xml_to_dict(self._root,depth=4)
        self.method_called = self._root.attrib.get('MethodCalled')
        self.location_param = xml_dict.get('location_param')
        self.variable_param = xml_dict.get('variable_param')
        try:
            self.begin_date_time = parser.parse(xml_dict['begin_date_time'])
        except:
            self.begin_date_time = None

        try:
            self.end_date_time = parser.parse(xml_dict['end_date_time'])
        except:
            self.end_date_time = None

        self.parameters = [(param.attrib.get('name'),param.attrib.get('value')) for param in self._findall('parameter')]
        # except:

def parse_category(self):
        try:
            xml_dict = _xml_to_dict(self._root)
            self.data_value = xml_dict.get('data_value')
            self.description = xml_dict.get('description')
            self.id = self._root.attrib.get('categoryID')
        except:
            raise

def parse_siteinfo(self,xml=None):
        if xml is not None:
            try:
                self._root = etree.parse(xml)
            except:
                self._root = xml

        # try:
        xml_dict = _xml_to_dict(self._root)
        self.site_name = xml_dict.get('site_name')
        self.site_codes = [testXMLValue(code) for code in self._findall('siteCode')]
        self.elevation = xml_dict.get('elevation_m')
        self.vertical_datum = xml_dict.get('vertical_datum')
        self.site_types = [testXMLValue(typ) for typ in self._findall('siteType')]
        self.site_properties = dict([(prop.attrib.get('name'),testXMLValue(prop)) for prop in self._findall('siteProperty')])
        self.altname = xml_dict.get('altname')
        self.notes = [testXMLValue(note) for note in self._findall('note')]
        # sub-objects
        tzi = self._find('timeZoneInfo')
        if tzi is not None:
            self.time_zone_info = TimeZoneInfo(tzi, self._ns)

        self.location = Location(self._find('geoLocation'), self._ns)

def parse_source(self):
        try:
            xml_dict = _xml_to_dict(self._root)
            self.id = self._root.attrib.get("sourceID", None)
            self.code = xml_dict.get('source_code')
            self.organization = xml_dict.get('organization')
            self.description = xml_dict.get('source_description')
            self.links = [testXMLValue(link) for link in self._findall('sourceLink')]
            self.citation = xml_dict.get('citation')
            # metadata
            self.topic_category = xml_dict.get('topic_category')
            self.title = xml_dict.get('title')
            self.abstract = xml_dict.get('abstract')
            self.profile_version = xml_dict.get('profile_version')
            self.metadata_link = xml_dict.get('metadata_link')
            # contact info
            self.contact_info = [ContactInformation(ci,self._ns) for ci in self._findall('contactInformation')]
        except:
            raise

def parse_siteinfo(self,xml=None):
        if xml is not None:
            try:
                self._root = etree.parse(xml)
            except:
                self._root = xml

        # try:
        # the following two lines add by Drew, 11/19/2015
        siteCodeEle = self._find('siteCode')
        self.net_work = siteCodeEle.attrib["network"]

        xml_dict = _xml_to_dict(self._root)
        self.site_name = xml_dict.get('site_name')
        self.site_codes = [testXMLValue(code) for code in self._findall('siteCode')]
        self.elevation = xml_dict.get('elevation_m')
        self.vertical_datum = xml_dict.get('vertical_datum')
        self.site_types = [testXMLValue(typ) for typ in self._findall('siteType')]
        self.site_properties = dict([(prop.attrib.get('name'),testXMLValue(prop)) for prop in self._findall('siteProperty')])
        self.altname = xml_dict.get('altname')
        self.notes = [testXMLValue(note) for note in self._findall('note')]
        # sub-objects
        tzi = self._find('timeZoneInfo')
        if tzi is not None:
            self.time_zone_info = TimeZoneInfo(tzi, self._ns)

        self.location = Location(self._find('geoLocation'), self._ns)

def parse_location(self,xml=None):
        if xml is not None:
            try:
                self._root = etree.parse(xml)
            except:
                self._root = xml

        # try:
        xml_dict = _xml_to_dict(self._root)
        geogs = self._findall('geogLocation')
        self.geo_coords = list()
        self.srs = list()
        for g in geogs:
            self.geo_coords.append((testXMLValue(g.find(ns(self._ns) + 'longitude')),testXMLValue(g.find(ns(self._ns) + 'latitude'))))
            self.srs.append(g.attrib.get('srs'))

        locsite = self._findall('localSiteXY')
        self.local_sites = list()
        self.notes = list()
        self.projections = list()
        for ls in locsite:
            z = testXMLValue(ls.find(ns(self._ns) + 'Z'))
            if z is not None:
                self.local_sites.append((testXMLValue(ls.find(ns(self._ns) + 'X')),testXMLValue(ls.find(ns(self._ns) + 'Y')),z))
            else:

def parse_query_info(self, xml=None):
        if xml is not None:
            try:
                self._root = etree.parse(xml)
            except:
                self._root = xml

        # try:
            # create queryinfo object from dict
        xml_dict = _xml_to_dict(self._root)
        self.creation_time = parser.parse(xml_dict.get('creation_time')) if xml_dict.get('creation_time') is not None else None
        self.notes = [testXMLValue(note) for note in self._findall('note')]
        self.criteria = Criteria(self._find('criteria'), self._ns)
        # except: