How to sum() positive/negative numbers in XSLT?

Question

To sum a series of values (positive or negative) use the sum() function in XPath.

In this example, we get transactions from an XML source and puts it into a variable. Then we sum it up in the end.

XML Source:

<month month="04">
 <balance in="987000,00" acnt="1100"/>
 <balance in="167440,00" acnt="1280"/>
 <balance in="1098000,00" acnt="1380"/>
 <balance in="575000,00" acnt="1460"/>
 <balance in="-75000,00" acnt="1469"/>
 ...
</month>

XSLT:

This results in the following structure:

<account>
 <month month="name">
  <in>987000.00</in>
 </month>
 ...
</account>

To sum the values we use the following XSLT snippet:

<xsl:value-of select="sum(ext:node-set($sumSet)//in)"/>

This example was run in Visual Studio.

Answer 1

The question was a bit off so I edited the whole thing and provided the answer. :)