The previous XSLT-based filter failed to import this correctly.

Change-Id: I6218bd2b3e5c5ac1514f84b959be27df23a0c3f8
Reviewed-on: https://gerrit.libreoffice.org/49907Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Kohei Yoshida <libreoffice@kohei.us>