[xsl] Summation and NaN

["Katie McNally" <kmcnally9@xxxxxxxxxxx>]

When I use the following:

<xsl:value-of 
select="format-number(sum(Borrower[Rank=1]/AssetSet/Asset/Amount), 
'$.00')"/>

the page displays "NaN" when none of the "Amount" elements in the XML have 
values.  Instead of NaN, I would like the page to display nothing (a blank) 
if no asset "Amount" values are returned in the XML.  How do I do this?

Thanks,
Katie


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