too many block-elements in xsl-fo ouput

[Ulrich Kilian <uk@science-and-more.de>]

Hello,

I want to use the attribute keep-together="always" to keep together
section title and the first para. Antenna house supports this feature.

My problem:

The fo output using the docbook xsl stylesheets (newest version)
contains too many fo:block-elements which means that the block
containing the paragraph content is not the block following the block
with the section title.

The transformation produces:
<fo:block id="...">
   <fo:block>
      <fo:block>
         <fo:block keep-together=always">
             <fo:block font-familiy=....>
                 <fo:block>title</fo:block>
             </fo:block>
         </fo:block>
      </fo:block>
   </fo:block>
   <fo:block>first paragraph of section</fo:block>
</fo:block>

It should produce something like this:
<fo:block id="...">
     <fo:block keep-together=always">
         <fo:block font-familiy=....>
             <fo:block>title</fo:block>
         </fo:block>
     </fo:block>
     <fo:block>first paragraph of section</fo:block>
</fo:block>

Can somebody help to arrive at this?

Best regards
Ulrich