XSL FO: note numbering by page

It is quite common to number footnotes and suchlike on a per-page
basis. I do not see how I can achieve this in XSL FO. For per-document
numbering I can do:

 <xsl:template match="note">
  <xsl:number level="any"/>. <xsl:apply-templates>
 </xsl:template>

but of course I cannot construct a `level' attribute that refers to
pages in the formatted output.

Presuming I _cannot_ do this with current XSL FO, does anyone have
suggestions for how it might be expressed if the FO working group agreed to
add the functionality?

Sebastian


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