How to use the pandocfilters.Link function in pandocfilters

def create_pandoc_multilink(strings, refs):
    inlines = [[pf.Str(str(s))] for s in strings]
    targets = [(r, "") for r in refs]
    links = [pf.Link(inline, target)
             for inline, target in zip(inlines, targets)]

    return join_items(links)

else:
            pre, label, post = value

        rtype = self.references[label]['type']
        n = self.references[label]['id']
        text = self.replacements[rtype].format(n)

        if format in self.formats:
            link = link_styles[format][rtype].format(text=text,
                                                     label=label,
                                                     pre=pre,
                                                     post=post)
            return RawInline(format, link)

        else:
            link = pf.Link([pf.Str(text)], ('#' + label, ''))
            return [pf.Str(pre), link, pf.Str(post)]

def _filter(key, value, format, meta):
            # remove HTML specific stuff
            if key == "Link":
                # remove relative path prefix and .html suffix
                internal, [href, text] = value
                if href.endswith(".html"):
                    href = href[:-5]
# FIXME: this stupid detection will not work
#        or just leave the full path?
#                    if href.startswith("./"):
#                        href = href[2:]
#                    elif href.startswith("../"):
#                        href = href[3:]
                return pandocfilters.Link(internal, [href, text])

def create_pandoc_multilink(strings, refs):
    inlines = [[pf.Str(str(s))] for s in strings]
    targets = [(r, "") for r in refs]
    links = [pf.Link(inline, target)
             for inline, target in zip(inlines, targets)]

    return join_items(links)

def transform_url(key, value, format, meta):
        if key != 'Link':
            return None
        # Then value has the following form:
        # [[{'t': 'Str', 'c': 'Contributing'}], ['docs/contributing.md', '']]
        # Extract the URL.
        url = value[1][0]
        new_url = convert_url(url)
        if new_url is None:
            return None
        log.info("converting URL:\n"
                 "   %s\n"
                 "-->%s" % (url, new_url))
        value[1][0] = new_url
        return Link(*value)
    return transform_url

if format == 'latex' and self.autoref:
            link = u'{pre}\\autoref{{{label}}}{post}'.format(pre=prefix,
                                                             label=label,
                                                             post=suffix)
            return pf.RawInline('latex', link)

        elif format == 'latex' and not self.autoref:
            link = u'{pre}\\ref{{{label}}}{post}'.format(pre=prefix,
                                                         label=label,
                                                         post=suffix)
            return pf.RawInline('latex', link)

        else:
            link_text = '{}{}{}'.format(prefix, text, suffix)
            link = pf.Link([pf.Str(link_text)], ('#' + label, ''))
            return link