sum() attribute values?

Hi,

Does someone know if it is possible to sum attribute values??
In the xml I would like to style I'm getting a count passed as attribute of
element <element count="xxx"/>.
If I try to use the XPATH function <xsl:value-of
select="sum(element/@count)"/> I'm just getting back a list of my count
entries.

Any ideas how to tell 'sum()' or another function to handle my attributes as
number??

Thanks,
-Michael


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