sorting and grouping

Subject: sorting and grouping
From: "m.vanrootseler" <m.vanrootseler@xxxxxxxxx>
Date: Fri, 2 Jul 2004 14:40:15 +0200
I've got a sorting problem. My XML is as follows:



<xsl:for-each select="person[birthmonth='January']">
    <xsl:sort select="birthday" data-type="number"/>
    <xsl:sort select="name"/>
    <xsl:value-of select="birthday"/>
    <xsl:text> - </xsl:text>
    <xsl:value-of select="name"/>

With the above code, each birthday number is repeated. What I would like is
to have the birthday number appear only once followed by the names of people
whose birthday that is. I suspect it can be done by testing if the birthday
value is the same as the preceding sibling, but I can't get it right. Does
anyone have any idea how to solve this? 


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