muenchian grouping is your friend.
add
<xsl:key name="page" match="*[(_at_)page-num]" use="@page-num"/>
then to test if the current node is the first node with a given page-num
you just need
<xsl:if test="generate-id(.)=generate-id(key('page',@page-num)[1])">
...
as the key will return all the nodes with the current page-num, and the
generate-id test tests that the current node is the first of those in
document order.
To comment on your posted code
<xsl:template match="/">
<xsl:for-each select="@page-num">
/ is the document root so has no attributes so this is iterating over
the empty node set and will therefore do nothing.
You could change it to <xsl:for-each select="//*(_at_)page-num"> but the
above key is likely to be a lot more efficient than building a list of
unique pages before starting.
David
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