sum() with decimal-separator ","

I try to calculate a summary by using
   select="sum(row/BUCHWERTBW)"

with a given decimal format like this:
		<row>
			<BUCHWERTBW>43023.7</BUCHWERTBW>
		</row>
it works well.


The problem is that I have to use a decimal format with
decimal-separator=",":
		<row>
			<BUCHWERTBW>43023,7</BUCHWERTBW>
		</row>

so the result is NaN. How can I use the function sum() with an
decimal-separator like "," ?

regards Manfred



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