FO: Show page number only if target is on different page

In the very old days, when I used IBM BookMaster to produce printed
documents from generic markup, BookMaster provided the feature of
automatically suppressing the "on page xx" text generated by cross
references if the thing referenced was on the same page as the
reference.

I would like to do the same thing with XSL FO but I don't think it's
possible in XSL 1.0. That is, I'd like to be able to do something like
this:

<xsl:template match="crossref">
  <fo:inline>
    <xsl:apply-templates select="id(@refid)" mode="xref"/>
    <fo:if-not-on-current-page ref-id="{generate-id(id(@refid))}">
      <xsl:text>, on page </xsl:text>
      <fo:page-number-citation ref-id="{generate-id(id(@refid))}"/>
    </fo:if-not-on-current-page>
  </fo:inline>
</xsl:template>

Is something like this possible today or should I submit this as an
extension requirement? Is this already a logged RFE?

Thanks,

Eliot
-- 
W. Eliot Kimber, eliot(_at_)isogen(_dot_)com
Consultant, ISOGEN International

1016 La Posada Dr., Suite 240
Austin, TX  78752 Phone: 512.656.4139

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