I have used your statements as follows:
<xsl:key name="page" match="*[(_at_)page-num]" use="@page-num"/>
<xsl:template match="/">
<h1><xsl:if
test="generate-id(.)=generate-id(key('page',@page-num)[1])"><x
sl:value-of
select="generate-id(key('page',@page-num)[1])"/></xsl:if></h1>
</xsl:apply-templates/>
</xsl:template>
David already pointed out to you that the document node (/) doesn't have any
attributes, so referring to @page-num in the template that matches "/" is
pointless. This code is clearly intended to go in the template rule for an
element that has a page-num attribute.
Michael Kay
http://www.saxonica.com/
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