예제 #1
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def commit_ncx_toc(container, toc, lang=None, uid=None):
    tocname = find_existing_ncx_toc(container)
    if tocname is None:
        item = container.generate_item('toc.ncx', id_prefix='toc')
        tocname = container.href_to_name(item.get('href'),
                                         base=container.opf_name)
        ncx_id = item.get('id')
        [s.set('toc', ncx_id) for s in container.opf_xpath('//opf:spine')]
    if not lang:
        lang = get_lang()
        for _l in container.opf_xpath('//dc:language'):
            _l = canonicalize_lang(base.xml2text(_l).strip())
            if _l:
                lang = _l
                lang = lang_as_iso639_1(_l) or _l
                break
    lang = lang_as_iso639_1(lang) or lang
    if not uid:
        uid = base.uuid_id()
        eid = container.opf.get('unique-identifier', None)
        if eid:
            m = container.opf_xpath('//*[@id="%s"]' % eid)
            if m:
                uid = base.xml2text(m[0])

    title = 'Table of Contents'
    m = container.opf_xpath('//dc:title')
    if m:
        x = base.xml2text(m[0]).strip()
        title = x or title

    to_href = functools.partial(container.name_to_href, base=tocname)
    root = create_ncx(toc, to_href, title, lang, uid)
    container.replace(tocname, root)
    container.pretty_print.add(tocname)
예제 #2
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 def norm(x):
     lc = x.langcode
     cc = x.countrycode or cc_map.get(lc, None)
     lc = lang_as_iso639_1(lc) or lc
     if cc:
         lc += '-' + cc
     return lc
예제 #3
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def iana2mobi(icode):
    langdict, subtags = IANA_MOBI[None], []
    if icode:
        subtags = list(icode.split('-'))
        while len(subtags) > 0:
            lang = subtags.pop(0).lower()
            lang = lang_as_iso639_1(lang)
            if lang and lang in IANA_MOBI:
                langdict = IANA_MOBI[lang]
                break

    mcode = langdict[None]
    while len(subtags) > 0:
        subtag = subtags.pop(0)
        if subtag not in langdict:
            subtag = subtag.title()
        if subtag not in langdict:
            subtag = subtag.upper()
        if subtag in langdict:
            mcode = langdict[subtag]
            break
    return pack('>HBB', 0, mcode[1], mcode[0])
예제 #4
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def html_lang(docx_lang):
    lang = canonicalize_lang(docx_lang)
    if lang and lang != 'und':
        lang = lang_as_iso639_1(lang)
        if lang:
            return lang
예제 #5
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 def migrate_lang_code(self, root):  # {{{
     from ebook_converter.utils.localization import lang_as_iso639_1
     for lang in root.xpath('//*[local-name() = "language"]'):
         clc = lang_as_iso639_1(lang.text)
         if clc:
             lang.text = clc
예제 #6
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    def fb2_header(self):
        metadata = {}
        metadata['title'] = self.oeb_book.metadata.title[0].value
        metadata['appname'] = __appname__
        metadata['version'] = __version__
        metadata['date'] = '%i.%i.%i' % (
            datetime.now().day, datetime.now().month, datetime.now().year)
        if self.oeb_book.metadata.language:
            lc = lang_as_iso639_1(self.oeb_book.metadata.language[0].value)
            if not lc:
                lc = self.oeb_book.metadata.language[0].value
            metadata['lang'] = lc or 'en'
        else:
            metadata['lang'] = u'en'
        metadata['id'] = None
        metadata['cover'] = self.get_cover()
        metadata['genre'] = self.opts.fb2_genre

        metadata['author'] = ''
        for auth in self.oeb_book.metadata.creator:
            author_first = ''
            author_middle = ''
            author_last = ''
            author_parts = auth.value.split(' ')
            if len(author_parts) == 1:
                author_last = author_parts[0]
            elif len(author_parts) == 2:
                author_first = author_parts[0]
                author_last = author_parts[1]
            else:
                author_first = author_parts[0]
                author_middle = ' '.join(author_parts[1:-1])
                author_last = author_parts[-1]
            metadata['author'] += '<author>'
            metadata['author'] += ('<first-name>%s</first-name>' %
                                   prepare_string_for_xml(author_first))
            if author_middle:
                metadata['author'] += ('<middle-name>%s</middle-name>' %
                                       prepare_string_for_xml(author_middle))
            metadata['author'] += ('<last-name>%s</last-name>' %
                                   prepare_string_for_xml(author_last))
            metadata['author'] += '</author>'
        if not metadata['author']:
            metadata['author'] = ('<author><first-name></first-name>'
                                  '<last-name></last-name></author>')

        metadata['keywords'] = ''
        tags = list(map(str, self.oeb_book.metadata.subject))
        if tags:
            tags = ', '.join(prepare_string_for_xml(x) for x in tags)
            metadata['keywords'] = '<keywords>%s</keywords>' % tags

        metadata['sequence'] = ''
        if self.oeb_book.metadata.series:
            index = '1'
            if self.oeb_book.metadata.series_index:
                index = self.oeb_book.metadata.series_index[0]
            seq = prepare_string_for_xml(str(self.oeb_book.metadata.series[0]))
            metadata['sequence'] = ('<sequence name="%s" number="%s"/>' %
                                    (seq, index))

        year = publisher = isbn = ''
        identifiers = self.oeb_book.metadata['identifier']
        for x in identifiers:
            if (x.get(base.tag('opf', 'scheme'), None).lower() == 'uuid'
                    or str(x).startswith('urn:uuid:')):
                metadata['id'] = str(x).split(':')[-1]
                break
        if metadata['id'] is None:
            self.log.warn('No UUID identifier found')
            metadata['id'] = str(uuid.uuid4())

        try:
            date = self.oeb_book.metadata['date'][0]
        except IndexError:
            pass
        else:
            year = ('<year>%s</year>' %
                    prepare_string_for_xml(date.value.partition('-')[0]))

        try:
            publisher = self.oeb_book.metadata['publisher'][0]
        except IndexError:
            pass
        else:
            publisher = ('<publisher>%s</publisher>' %
                         prepare_string_for_xml(publisher.value))

        for x in identifiers:
            if x.get(base.tag('opf', 'scheme'), None).lower() == 'isbn':
                isbn = '<isbn>%s</isbn>' % prepare_string_for_xml(x.value)

        metadata['year'] = year
        metadata['isbn'] = isbn
        metadata['publisher'] = publisher
        for key, value in metadata.items():
            if key not in ('author', 'cover', 'sequence', 'keywords', 'year',
                           'publisher', 'isbn'):
                metadata[key] = prepare_string_for_xml(value)

        try:
            comments = self.oeb_book.metadata['description'][0]
        except Exception:
            metadata['comments'] = ''
        else:
            from ebook_converter.utils.html2text import html2text
            annot = prepare_string_for_xml(html2text(comments.value).strip())
            metadata['comments'] = f'<annotation><p>{annot}</p></annotation>'

        # Keep the indentation level of the description the same as the body.
        header = textwrap.dedent('''\
            <FictionBook xmlns="http://www.gribuser.ru/xml/fictionbook/2.0" xmlns:l="http://www.w3.org/1999/xlink">
            <description>
                <title-info>
                    <genre>%(genre)s</genre>
                    %(author)s
                    <book-title>%(title)s</book-title>
                    %(cover)s
                    <lang>%(lang)s</lang>
                    %(keywords)s
                    %(sequence)s
                    %(comments)s
                </title-info>
                <document-info>
                    %(author)s
                    <program-used>%(appname)s %(version)s</program-used>
                    <date>%(date)s</date>
                    <id>%(id)s</id>
                    <version>1.0</version>
                </document-info>
                <publish-info>
                    %(publisher)s
                    %(year)s
                    %(isbn)s
                </publish-info>
            </description>''') % metadata

        # Remove empty lines.
        return '\n'.join(filter(str.strip, header.splitlines()))
예제 #7
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 def __init__(self, namespace, log, document_lang):
     self.namespace = namespace
     self.document_lang = lang_as_iso639_1(document_lang) or 'en'
     self.log = log
     self.block_styles, self.text_styles = {}, {}
     self.styles_for_html_blocks = {}
예제 #8
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def commit_nav_toc(container,
                   toc,
                   lang=None,
                   landmarks=None,
                   previous_nav=None):
    from ebook_converter.ebooks.oeb.polish.pretty import pretty_xml_tree
    tocname = find_existing_nav_toc(container)
    if previous_nav is not None:
        nav_name = container.href_to_name(previous_nav[0])
        if nav_name and container.exists(nav_name):
            tocname = nav_name
            container.apply_unique_properties(tocname, 'nav')
    if tocname is None:
        item = container.generate_item('nav.xhtml', id_prefix='nav')
        item.set('properties', 'nav')
        tocname = container.href_to_name(item.get('href'),
                                         base=container.opf_name)
        if previous_nav is not None:
            root = previous_nav[1]
        else:
            with open(
                    pkg_resources.resource_filename(
                        'ebook_converter', 'data/new_nav.html')) as fobj:
                root = container.parse_xhtml(fobj.read())
        container.replace(tocname, root)
    else:
        root = container.parsed(tocname)
    if lang:
        lang = lang_as_iso639_1(lang) or lang
        root.set('lang', lang)
        root.set(base.tag('xml', 'lang'), lang)
    nav = ensure_single_nav_of_type(root, 'toc')
    if toc.toc_title:
        nav.append(nav.makeelement(base.tag('xhtml', 'h1')))
        nav[-1].text = toc.toc_title

    rnode = nav.makeelement(base.tag('xhtml', 'ol'))
    nav.append(rnode)
    to_href = functools.partial(container.name_to_href, base=tocname)
    spat = re.compile(r'\s+')

    def process_node(xml_parent, toc_parent):
        for child in toc_parent:
            li = xml_parent.makeelement(base.tag('xhtml', 'li'))
            xml_parent.append(li)
            title = child.title or ''
            title = spat.sub(' ', title).strip()
            a = li.makeelement(base.tag('xhtml',
                                        'a' if child.dest else 'span'))
            a.text = title
            li.append(a)
            if child.dest:
                href = to_href(child.dest)
                if child.frag:
                    href += '#' + child.frag
                a.set('href', href)
            if len(child):
                ol = li.makeelement(base.tag('xhtml', 'ol'))
                li.append(ol)
                process_node(ol, child)

    process_node(rnode, toc)
    pretty_xml_tree(nav)

    def collapse_li(parent):
        for li in parent.iterdescendants(base.tag('xhtml', 'li')):
            if len(li) == 1:
                li.text = None
                li[0].tail = None

    collapse_li(nav)
    nav.tail = '\n'

    def create_li(ol, entry):
        li = ol.makeelement(base.tag('xhtml', 'li'))
        ol.append(li)
        a = li.makeelement(base.tag('xhtml', 'a'))
        li.append(a)
        href = container.name_to_href(entry['dest'], tocname)
        if entry['frag']:
            href += '#' + entry['frag']
        a.set('href', href)
        return a

    if landmarks is not None:
        nav = ensure_single_nav_of_type(root, 'landmarks')
        nav.set('hidden', '')
        ol = nav.makeelement(base.tag('xhtml', 'ol'))
        nav.append(ol)
        for entry in landmarks:
            if (entry['type'] and container.has_name(entry['dest'])
                    and container.mime_map[entry['dest']] in base.OEB_DOCS):
                a = create_li(ol, entry)
                a.set(base.tag('epub', 'type'), entry['type'])
                a.text = entry['title'] or None
        pretty_xml_tree(nav)
        collapse_li(nav)

    if toc.page_list:
        nav = ensure_single_nav_of_type(root, 'page-list')
        nav.set('hidden', '')
        ol = nav.makeelement(base.tag('xhtml', 'ol'))
        nav.append(ol)
        for entry in toc.page_list:
            if (container.has_name(entry['dest'])
                    and container.mime_map[entry['dest']] in base.OEB_DOCS):
                a = create_li(ol, entry)
                a.text = str(entry['pagenum'])
        pretty_xml_tree(nav)
        collapse_li(nav)
    container.replace(tocname, root)
예제 #9
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def build_exth(metadata, prefer_author_sort=False, is_periodical=False,
               share_not_sync=True, cover_offset=None, thumbnail_offset=None,
               start_offset=None, mobi_doctype=2, num_of_resources=None,
               kf8_unknown_count=0, be_kindlegen2=False, kf8_header_index=None,
               page_progression_direction=None, primary_writing_mode=None):
    exth = BytesIO()
    nrecs = 0

    for term in metadata:
        if term not in EXTH_CODES:
            continue
        code = EXTH_CODES[term]
        items = metadata[term]
        if term == 'creator':
            if prefer_author_sort:
                creators = [authors_to_sort_string([str(c)]) for c in
                            items]
            else:
                creators = [str(c) for c in items]
            items = creators
        elif term == 'rights':
            try:
                rights = utf8_text(str(metadata.rights[0]))
            except Exception:
                rights = b'Unknown'
            exth.write(pack(b'>II', EXTH_CODES['rights'], len(rights) + 8))
            exth.write(rights)
            nrecs += 1
            continue

        for item in items:
            data = str(item)
            if term != 'description':
                data = COLLAPSE_RE.sub(' ', data)
            if term == 'identifier':
                if data.lower().startswith('urn:isbn:'):
                    data = data[9:]
                elif item.scheme.lower() == 'isbn':
                    pass
                else:
                    continue
            if term == 'language':
                d2 = lang_as_iso639_1(data)
                if d2:
                    data = d2
            data = utf8_text(data)
            exth.write(pack(b'>II', code, len(data) + 8))
            exth.write(data)
            nrecs += 1

    # Write UUID as ASIN
    uuid = None
    for x in metadata['identifier']:
        if (x.get(base.tag('opf', 'scheme'), None).lower() == 'uuid' or
                str(x).startswith('urn:uuid:')):
            uuid = str(x).split(':')[-1]
            break
    if uuid is None:
        from uuid import uuid4
        uuid = str(uuid4())

    if isinstance(uuid, str):
        uuid = uuid.encode('utf-8')
    if not share_not_sync:
        exth.write(pack(b'>II', 113, len(uuid) + 8))
        exth.write(uuid)
        nrecs += 1

    # Write UUID as SOURCE
    c_uuid = b'calibre:%s' % uuid
    exth.write(pack(b'>II', 112, len(c_uuid) + 8))
    exth.write(c_uuid)
    nrecs += 1

    # Write cdetype
    if not is_periodical:
        if not share_not_sync:
            exth.write(pack(b'>II', 501, 12))
            exth.write(b'EBOK')
            nrecs += 1
    else:
        ids = {0x101: b'NWPR', 0x103: b'MAGZ'}.get(mobi_doctype, None)
        if ids:
            exth.write(pack(b'>II', 501, 12))
            exth.write(ids)
            nrecs += 1

    # Add a publication date entry
    if metadata['date']:
        datestr = str(metadata['date'][0])
    elif metadata['timestamp']:
        datestr = str(metadata['timestamp'][0])

    if datestr is None:
        raise ValueError("missing date or timestamp")

    datestr = datestr.encode('utf-8')
    exth.write(pack(b'>II', EXTH_CODES['pubdate'], len(datestr) + 8))
    exth.write(datestr)
    nrecs += 1
    if is_periodical:
        exth.write(pack(b'>II', EXTH_CODES['lastupdatetime'],
                        len(datestr) + 8))
        exth.write(datestr)
        nrecs += 1

    if be_kindlegen2:
        mv = 201
        vals = {204: mv, 205: 2, 206: 9, 207: 0}
    elif is_periodical:
        # Pretend to be amazon's super secret periodical generator
        vals = {204: 201, 205: 2, 206: 0, 207: 101}
    else:
        # Pretend to be kindlegen 1.2
        vals = {204: 201, 205: 1, 206: 2, 207: 33307}
    for code, val in vals.items():
        exth.write(pack(b'>III', code, 12, val))
        nrecs += 1
    if be_kindlegen2:
        revnum = b'0730-890adc2'
        exth.write(pack(b'>II', 535, 8 + len(revnum)) + revnum)
        nrecs += 1

    if cover_offset is not None:
        exth.write(pack(b'>III', EXTH_CODES['coveroffset'], 12,
                        cover_offset))
        exth.write(pack(b'>III', EXTH_CODES['hasfakecover'], 12, 0))
        nrecs += 2
    if thumbnail_offset is not None:
        exth.write(pack(b'>III', EXTH_CODES['thumboffset'], 12,
                        thumbnail_offset))
        thumbnail_uri_str = ('kindle:embed:%s' %
                             to_base(thumbnail_offset, base=32,
                                     min_num_digits=4)).encode('utf-8')
        exth.write(pack(b'>II', EXTH_CODES['kf8_thumbnail_uri'],
                        len(thumbnail_uri_str) + 8))
        exth.write(thumbnail_uri_str)
        nrecs += 2

    if start_offset is not None:
        try:
            len(start_offset)
        except TypeError:
            start_offset = [start_offset]
        for so in start_offset:
            if so is not None:
                exth.write(pack(b'>III', EXTH_CODES['startreading'], 12, so))
                nrecs += 1

    if kf8_header_index is not None:
        exth.write(pack(b'>III', EXTH_CODES['kf8_header_index'], 12,
                        kf8_header_index))
        nrecs += 1

    if num_of_resources is not None:
        exth.write(pack(b'>III', EXTH_CODES['num_of_resources'], 12,
                        num_of_resources))
        nrecs += 1

    if kf8_unknown_count is not None:
        exth.write(pack(b'>III', EXTH_CODES['kf8_unknown_count'], 12,
                        kf8_unknown_count))
        nrecs += 1

    if primary_writing_mode:
        pwm = primary_writing_mode.encode('utf-8')
        exth.write(pack(b'>II', EXTH_CODES['primary_writing_mode'],
                        len(pwm) + 8))
        exth.write(pwm)
        nrecs += 1

    if page_progression_direction in {'rtl', 'ltr', 'default'}:
        ppd = page_progression_direction.encode('ascii')
        exth.write(pack(b'>II', EXTH_CODES['page_progression_direction'],
                        len(ppd) + 8))
        exth.write(ppd)
        nrecs += 1

    exth = exth.getvalue()
    trail = len(exth) % 4
    pad = b'\0' * (4 - trail)  # Always pad w/ at least 1 byte
    exth = [b'EXTH', pack(b'>II', len(exth) + 12, nrecs), exth, pad]
    return b''.join(exth)
예제 #10
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def metadata_to_xmp_packet(mi):
    A = ElementMaker(namespace=NS_MAP['x'], nsmap=nsmap('x'))
    R = ElementMaker(namespace=NS_MAP['rdf'], nsmap=nsmap('rdf'))
    root = A.xmpmeta(R.RDF)
    rdf = root[0]
    dc = rdf.makeelement(expand('rdf:Description'), nsmap=nsmap('dc'))
    dc.set(expand('rdf:about'), '')
    rdf.append(dc)
    for prop, tag in {
            'title': 'dc:title',
            'comments': 'dc:description'
    }.items():
        val = mi.get(prop) or ''
        create_alt_property(dc, tag, val)
    for prop, (tag, ordered) in {
            'authors': ('dc:creator', True),
            'tags': ('dc:subject', False),
            'publisher': ('dc:publisher', False)
    }.items():
        val = mi.get(prop) or ()
        if isinstance(val, (str, bytes)):
            val = [val]
        create_sequence_property(dc, tag, val, ordered)
    if not mi.is_null('pubdate'):
        # Adobe spec recommends local time
        create_sequence_property(dc, 'dc:date',
                                 [isoformat(mi.pubdate, as_utc=False)])
    if not mi.is_null('languages'):
        langs = list(
            filter(
                None,
                map(lambda x: lang_as_iso639_1(x) or canonicalize_lang(x),
                    mi.languages)))
        if langs:
            create_sequence_property(dc, 'dc:language', langs, ordered=False)

    xmp = rdf.makeelement(expand('rdf:Description'),
                          nsmap=nsmap('xmp', 'xmpidq'))
    xmp.set(expand('rdf:about'), '')
    rdf.append(xmp)
    extra_ids = {}
    for x in ('prism', 'pdfx'):
        p = extra_ids[x] = rdf.makeelement(expand('rdf:Description'),
                                           nsmap=nsmap(x))
        p.set(expand('rdf:about'), '')
        rdf.append(p)

    identifiers = mi.get_identifiers()
    if identifiers:
        create_identifiers(xmp, identifiers)
        for scheme, val in identifiers.items():
            if scheme in {'isbn', 'doi'}:
                for prefix, parent in extra_ids.items():
                    ie = parent.makeelement(expand('%s:%s' % (prefix, scheme)))
                    ie.text = val
                    parent.append(ie)

    d = xmp.makeelement(expand('xmp:MetadataDate'))
    d.text = isoformat(now(), as_utc=False)
    xmp.append(d)

    calibre = rdf.makeelement(expand('rdf:Description'),
                              nsmap=nsmap('calibre', 'calibreSI', 'calibreCC'))
    calibre.set(expand('rdf:about'), '')
    rdf.append(calibre)
    if not mi.is_null('rating'):
        try:
            r = float(mi.rating)
        except (TypeError, ValueError):
            pass
        else:
            create_simple_property(calibre, 'calibre:rating', '%g' % r)
    if not mi.is_null('series'):
        create_series(calibre, mi.series, mi.series_index)
    if not mi.is_null('timestamp'):
        create_simple_property(calibre, 'calibre:timestamp',
                               isoformat(mi.timestamp, as_utc=False))
    for x in ('author_link_map', 'user_categories'):
        val = getattr(mi, x, None)
        if val:
            create_simple_property(calibre, 'calibre:' + x, dump_dict(val))

    for x in ('title_sort', 'author_sort'):
        if not mi.is_null(x):
            create_simple_property(calibre, 'calibre:' + x, getattr(mi, x))

    all_user_metadata = mi.get_all_user_metadata(True)
    if all_user_metadata:
        create_user_metadata(calibre, all_user_metadata)
    return serialize_xmp_packet(root)
예제 #11
0
def lang_for_tag(tag):
    for attr in ('lang', '{http://www.w3.org/XML/1998/namespace}lang'):
        val = lang_as_iso639_1(tag.get(attr))
        if val:
            return val
예제 #12
0
def _set_metadata(raw, mi):
    root = fromstring(raw)
    namespaces = {'office': OFFICENS, 'meta': METANS, 'dc': DCNS}
    nsrmap = {v: k for k, v in namespaces.items()}

    def xpath(expr, parent=root):
        return parent.xpath(expr, namespaces=namespaces)

    def remove(*tag_names):
        for tag_name in tag_names:
            ns = fields[tag_name][0]
            tag_name = '{}:{}'.format(nsrmap[ns], tag_name)
            for x in xpath('descendant::' + tag_name, meta):
                x.getparent().remove(x)

    def add(tag, val=None):
        ans = meta.makeelement('{%s}%s' % fields[tag])
        ans.text = val
        meta.append(ans)
        return ans

    def remove_user_metadata(*names):
        for x in xpath('//meta:user-defined'):
            q = (x.get('{%s}name' % METANS) or '').lower()
            if q in names:
                x.getparent().remove(x)

    def add_um(name, val, vtype='string'):
        ans = add('user-defined', val)
        ans.set('{%s}value-type' % METANS, vtype)
        ans.set('{%s}name' % METANS, name)

    def add_user_metadata(name, val):
        if not hasattr(add_user_metadata, 'sentinel_added'):
            add_user_metadata.sentinel_added = True
            remove_user_metadata('opf.metadata')
            add_um('opf.metadata', 'true', 'boolean')
        val_type = 'string'
        if hasattr(val, 'strftime'):
            val = isoformat(val, as_utc=True).split('T')[0]
            val_type = 'date'
        add_um(name, val, val_type)

    meta = xpath('//office:meta')[0]

    if not mi.is_null('title'):
        remove('title')
        add('title', mi.title)
        if not mi.is_null('title_sort'):
            remove_user_metadata('opf.titlesort')
            add_user_metadata('opf.titlesort', mi.title_sort)
    if not mi.is_null('authors'):
        remove('initial-creator', 'creator')
        val = authors_to_string(mi.authors)
        add('initial-creator', val), add('creator', val)
        remove_user_metadata('opf.authors')
        add_user_metadata('opf.authors', val)
        if not mi.is_null('author_sort'):
            remove_user_metadata('opf.authorsort')
            add_user_metadata('opf.authorsort', mi.author_sort)
    if not mi.is_null('comments'):
        remove('description')
        add('description', mi.comments)
    if not mi.is_null('tags'):
        remove('keyword')
        add('keyword', ', '.join(mi.tags))
    if not mi.is_null('languages'):
        lang = lang_as_iso639_1(mi.languages[0])
        if lang:
            remove('language')
            add('language', lang)
    if not mi.is_null('pubdate'):
        remove_user_metadata('opf.pubdate')
        add_user_metadata('opf.pubdate', mi.pubdate)
    if not mi.is_null('publisher'):
        remove_user_metadata('opf.publisher')
        add_user_metadata('opf.publisher', mi.publisher)
    if not mi.is_null('series'):
        remove_user_metadata('opf.series', 'opf.seriesindex')
        add_user_metadata('opf.series', mi.series)
        add_user_metadata('opf.seriesindex', '{}'.format(mi.series_index))
    if not mi.is_null('identifiers'):
        remove_user_metadata('opf.identifiers')
        add_user_metadata('opf.identifiers', str(json.dumps(mi.identifiers)))
    if not mi.is_null('rating'):
        remove_user_metadata('opf.rating')
        add_user_metadata('opf.rating', '%.2g' % mi.rating)

    return tostring(root, encoding='utf-8', pretty_print=True)