sofftodocbookheadings_article.xsl makes invalid DocBook

Hi

It seems that OpenOffice.org DocBook filter,
sofftodocbookheadings_article.xsl, makes invalid DocBook.

Following is what I'm trying.

0. Set DocBook Filter Settings by referring an instruction.
http://xml.openoffice.org/xmerge/docbook/
1. Open a document that is created by MS word with OpenOffcie.org.
2. Export DocBook(<article>).
3. Try to validate it.
> xml val -d http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd 
> docbook.xml


Any comments would be appreciated.

Regards,
--Hisashi.Yamaguchi

OS             : Windows XP SP2
OpenOffice  : 1.1.4en
XML Parser : XMLStarlet0.9.3