Just in case you're using XSL still, you could use <xsl:key/> to let you quickly do subtotals by summing the node set of items that match whatever grouping leve

Just in case you're using XSL still, you could use <xsl:key/> to let you quickly do subtotals by summing the node set of items that match whatever grouping level you're on when you emit the last item in the group. <xsl:key name="items-by-order" match="item" use="../@orderid"/> ...snip... <!-- Union current item node with last item node of the order - if it's the same, the count will be one --> <xsl:if test="count(. | key('items-by-order', ../@orderid)[last()]) = 1"> <xsl:value-of select="sum(key('items-by-order', ../@orderid))"/> </xsl:if> Running totals would be similar, except that your apply-templates for the item group would include a select that restricts the available nodes to the key() function's result, and you would sum current node with preceding nodes.