XSL FO: running head on first page of sequence

I think I have reached a dead end. What I want to achieve is a
different running head for the first page of a page-sequence. So on
the first page of a chapter, there is no running head, but thereafter
it is the chapter name. 

But <fo:static-content> can only occur _inside_ a page-sequence, without 
(so far as I can see) any way of specifying that it should apply only
for a particular page-master. 

Can I simply (as a limited answer), omit the region-after? ie
instead of 

     <fo:simple-page-master page-master-name="first">
        <fo:region-body />
        <fo:region-after/>
        <fo:region-before/>
      </fo:simple-page-master>

if I say

     <fo:simple-page-master page-master-name="first">
        <fo:region-body />
        <fo:region-after/>
      </fo:simple-page-master>

does that mean that region-before is not to be produced?

Yes, I realize that this relates to the earlier discussion of how to
do variable headers, but perhaps I have missed something obvious which 
allows the cruder problem to be solved?

Sebastian


 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list