Customising header.content template for XSL/FO

Hi All,

I am trying to customise headers in my PDF output (xsltproc/FOP 
toolchain) by overriding the header.content template
in my driver file. Whatever I do, even if I simply copy the original 
template across, I get errors of the form:

XML/config-fo.xsl:37: warning: Namespace prefix fo is not defined
   <fo:block>
            ^
XML/config-fo.xsl:48: warning: Namespace prefix fo is not defined
         <fo:page-number/>
                        ^

Without the copy of the header.content template in the driver file, all 
is well. I have seen this customisation discussed on the list, so it 
must work for others. Any ideas?

Thanks,

Nick.


System: xsltproc and FOP on Mac OS X, all latest versions. Release 
1.63.1 of the XSL style sheets.
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Nick Hunt