How to use the podcastparser.AtomLink function in podcastparser

rel = attrs.get('rel', 'alternate')
        url = parse_url(urlparse.urljoin(handler.base, attrs.get('href')))
        mime_type = parse_type(attrs.get('type', 'text/html'))
        file_size = parse_length(attrs.get('length', '0'))

        if rel == 'enclosure':
            handler.add_enclosure(url, file_size, mime_type)
        elif rel == 'payment':
            handler.set_episode_attr('payment_url', url)
        elif mime_type == 'text/html':
            if rel in ('self', 'alternate'):
                if not handler.get_episode_attr('link'):
                    handler.set_episode_attr('link', url)


class PodcastAtomLink(AtomLink):
    def start(self, handler, attrs):
        rel = attrs.get('rel', 'alternate')
        url = parse_url(urlparse.urljoin(handler.base, attrs.get('href')))
        mime_type = parse_type(attrs.get('type'))

        # RFC 5005 (http://podlove.org/paged-feeds/)
        if rel == 'first':
            handler.set_podcast_attr('paged_feed_first', url)
        elif rel == 'next':
            handler.set_podcast_attr('paged_feed_next', url)
        elif rel == 'payment':
            handler.set_podcast_attr('payment_url', url)
        elif mime_type == 'text/html':
            if rel in ('self', 'alternate'):
                handler.set_podcast_attr('link', url)