Is't possible, for this example, elements with @id
2 or 3 to be selected first and after to be summarized @due
and/or @init?
Yes, that's what variables are for.
<xsl:variable name="selectedNodes" select=".... the nodes ..."/>
<xsl:value-of select="sum($selectedNodes/@due)"/>
Michael Kay
http://www.saxonica.com/
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