doctype='<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"' +
' "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">'
)
+ html_string = re.sub(ur'([^\r])\n', ur'\1\r\n', html_string)
zip.writestr('OPS/part%d.html' % chunk_counter, html_string)
add_to_manifest(manifest, chunk_counter)
add_to_spine(spine, chunk_counter)