How to use the youtube-dl.youtube_dl.utils.xpath_text function in youtube_dl

'description': xpath_text(item, 'description'),
                'timestamp': timestamp,
                'duration': int_or_none(content.get('duration')),
                'age_limit': parse_age_limit(xpath_text(item, _add_ns('media:rating'))),
                'episode': xpath_text(item, _add_ns('clearleap:episode')),
                'episode_number': int_or_none(xpath_text(item, _add_ns('clearleap:episodeInSeason'))),
                'series': xpath_text(item, _add_ns('clearleap:series')),
                'season_number': int_or_none(xpath_text(item, _add_ns('clearleap:season'))),
                'thumbnails': thumbnails,
                'ie_key': 'CBCWatchVideo',
            })

        return self.playlist_result(
            entries, xpath_text(channel, 'guid'),
            xpath_text(channel, 'title'),
            xpath_text(channel, 'description'))

if video_source_format == 'IIS':
                formats.extend(self._extract_ism_formats(
                    content_url, video_id, ism_id=video_source_format, fatal=False))
            else:
                formats.extend(self._extract_m3u8_formats(
                    content_url, video_id, 'mp4',
                    'm3u8' if is_live else 'm3u8_native',
                    m3u8_id=video_source_format, fatal=False))
        self._sort_formats(formats)

        return {
            'id': video_id,
            'display_id': display_id,
            'title': title,
            'description': xpath_text(video_doc, 'description'),
            'thumbnail': xpath_text(video_doc, 'thumbnailUrl'),
            'duration': parse_duration(xpath_text(video_doc, 'duration')),
            'formats': formats,
            'is_live': is_live,
        }

def _parse_xspf(self, xspf_doc, playlist_id, xspf_url=None, xspf_base_url=None):
        NS_MAP = {
            'xspf': 'http://xspf.org/ns/0/',
            's1': 'http://static.streamone.nl/player/ns/0',
        }

        entries = []
        for track in xspf_doc.findall(xpath_with_ns('./xspf:trackList/xspf:track', NS_MAP)):
            title = xpath_text(
                track, xpath_with_ns('./xspf:title', NS_MAP), 'title', default=playlist_id)
            description = xpath_text(
                track, xpath_with_ns('./xspf:annotation', NS_MAP), 'description')
            thumbnail = xpath_text(
                track, xpath_with_ns('./xspf:image', NS_MAP), 'thumbnail')
            duration = float_or_none(
                xpath_text(track, xpath_with_ns('./xspf:duration', NS_MAP), 'duration'), 1000)

            formats = []
            for location in track.findall(xpath_with_ns('./xspf:location', NS_MAP)):
                format_url = urljoin(xspf_base_url, location.text)
                if not format_url:
                    continue
                formats.append({
                    'url': format_url,
                    'manifest_url': xspf_url,

mediagen_url, video_id, 'Downloading video urls', fatal=False)

        if mediagen_doc is False:
            return None

        item = mediagen_doc.find('./video/item')
        if item is not None and item.get('type') == 'text':
            message = '%s returned error: ' % self.IE_NAME
            if item.get('code') is not None:
                message += '%s - ' % item.get('code')
            message += item.text
            raise ExtractorError(message, expected=True)

        description = strip_or_none(xpath_text(itemdoc, 'description'))

        timestamp = timeconvert(xpath_text(itemdoc, 'pubDate'))

        title_el = None
        if title_el is None:
            title_el = find_xpath_attr(
                itemdoc, './/{http://search.yahoo.com/mrss/}category',
                'scheme', 'urn:mtvn:video_title')
        if title_el is None:
            title_el = itemdoc.find(compat_xpath('.//{http://search.yahoo.com/mrss/}title'))
        if title_el is None:
            title_el = itemdoc.find(compat_xpath('.//title'))
            if title_el.text is None:
                title_el = None

        title = title_el.text
        if title is None:
            raise ExtractorError('Could not find video title')

mediagen_doc = self._download_xml(
            mediagen_url, video_id, 'Downloading video urls', fatal=False)

        if mediagen_doc is False:
            return None

        item = mediagen_doc.find('./video/item')
        if item is not None and item.get('type') == 'text':
            message = '%s returned error: ' % self.IE_NAME
            if item.get('code') is not None:
                message += '%s - ' % item.get('code')
            message += item.text
            raise ExtractorError(message, expected=True)

        description = strip_or_none(xpath_text(itemdoc, 'description'))

        timestamp = timeconvert(xpath_text(itemdoc, 'pubDate'))

        title_el = None
        if title_el is None:
            title_el = find_xpath_attr(
                itemdoc, './/{http://search.yahoo.com/mrss/}category',
                'scheme', 'urn:mtvn:video_title')
        if title_el is None:
            title_el = itemdoc.find(compat_xpath('.//{http://search.yahoo.com/mrss/}title'))
        if title_el is None:
            title_el = itemdoc.find(compat_xpath('.//title'))
            if title_el.text is None:
                title_el = None

        title = title_el.text

def _call_api(self, path, video_id):
        url = path if path.startswith('http') else self._API_BASE_URL + path
        result = self._download_xml(url, video_id, headers={
            'X-Clearleap-DeviceId': self._device_id,
            'X-Clearleap-DeviceToken': self._device_token,
        })
        error_message = xpath_text(result, 'userMessage') or xpath_text(result, 'systemMessage')
        if error_message:
            raise ExtractorError('%s said: %s' % (self.IE_NAME, error_message))
        return result

def _get_videos_info_from_url(self, url, video_id, use_hls=True):
        idoc = self._download_xml(
            url, video_id,
            'Downloading info', transform_source=fix_xml_ampersands)

        title = xpath_text(idoc, './channel/title')
        description = xpath_text(idoc, './channel/description')

        entries = []
        for item in idoc.findall('.//item'):
            info = self._get_video_info(item, use_hls)
            if info:
                entries.append(info)

        return self.playlist_result(
            entries, playlist_title=title, playlist_description=description)

entries = []
        for f in vid_config.findall('./durl'):
            segment_url = xpath_text(f, 'url', 'video url')
            if not segment_url:
                continue
            order = xpath_text(f, 'order', 'order')
            segment_id = video_id
            segment_title = title
            if order:
                segment_id += '-%s' % order
                segment_title += ' part %s' % order
            entries.append({
                'id': segment_id,
                'url': segment_url,
                'title': segment_title,
                'duration': int_or_none(xpath_text(f, 'length', 'duration'), 1000),
                'http_headers': http_headers,
            })

        return entries