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[xsl] Restrictind a set of notes to within a group

Subject: [xsl] Restrictind a set of notes to within a group
From: "Mark" <mark@xxxxxxxxxxxx>
Date: Thu, 19 Apr 2012 07:17:11 -0700

have an xml file like
   <Date day=b1b>
       <Session task=btask1b>
           <Notes hours-worked=b1.5b/>
       <Session task=btask2b>
           Notes hours-worked=b5b/>
       <Session task=btask1b>
           <Notes hours-worked=b3b/>
   <Date day=b2b>
For the month, I want to sum all the hours-worked for each task:

I have tried several expressions, but failed. This gives me the total hours worked on all tasks rather than each individual task:
<xsl:for-each-group select="Date/Session" group-by="@task">
<xsl:for-each select=".">
<fo:block xsl:use-attribute-sets="subdiv2">
<xsl:value-of select="@task"/>
<xsl:text> (</xsl:text>
<xsl:value-of select="format-number(sum(../../Date/Session/Notes/@hours-worked), '.00')"/>
<xsl:text>) </xsl:text>
How do I restrict the total to just the hours-worked on each specific task?

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