How can I sum values in multiple rows

["Walther, Moritz" <walther@xxxxxxxx>]

Hi again, 

I'm generating xml-Files from a database and I want to sum values of
multiple rows like

<xsl:value-of select="format-number(SONDERSET/ROW[@ID='1'] +
SONDERSET/ROW[@ID='2'] + SONDERSET/ROW[@ID='3'],'###.##0,00')"/>

Now the problem is, that I don't know how many rows are there so I need a
possibility to do something like :

<xsl:value-of select="format-number(SONDERSET/ROW[@ID='*'],'###.##0,00')"/>

any suggestions ??

thanx in advance.

Moritz.


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