Hello.

Im trying to sum all the "poeng" elements from the xml file.

 <test>
    <oppgave nr="1">
      <svar>c</svar>
      <poeng>3</poeng>
    </oppgave>
    <oppgave nr="2">
      <svar>b</svar>
      <poeng>-1</poeng>
      <kommentar>error</kommentar>
    </oppgave>
    <oppgave nr="3">
      <svar>b</svar>
      <poeng>3</poeng>
    </oppgave>
    <oppgave nr="4">
      <svar>a</svar>
      <poeng>0</poeng>
    </oppgave>
    <oppgave nr="5">
      <svar>c</svar>
      <poeng>3</poeng>
    </oppgave>
  </test>

so in XSL I have this for-each:

<xsl:for-each select="test/oppgave">
 sum(poeng)
</xsl:for-each>

--> get the sum here

If you want a single sum for the whole source document, that's sum(/test/oppgave/poeng). Doing the sum() inside a for-each would only be appropriate if you want multiple totals (ie. subtotals).

Michael Kay
http://www.saxonica.com/
Author, XSLT Programmer's Reference and XPath 2.0 Programmer's Reference