sum Function (XPath)

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Returns the sum of all nodes in the node-set. Each node is first converted to a number value before summing.

number sum(node-set)

Example

This example demonstrates the XPath expression sum(//a). It returns 6, which is the sum of the numbers in <a> elements.

XML File (as.xml)

<?xml version='1.0'?>
<?xml-stylesheet type="text/xsl" href="sum.xsl"?>
<root>
  <a>1</a>
  <a>3</a>
  <a>2</a>
</root>

XSLT File (sum.xsl)

<?xml version='1.0'?>
<xsl:stylesheet version="1.0"
      xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

<xsl:template match="/">
   <xsl:value-of select='sum(//a)'/>
</xsl:template>

</xsl:stylesheet>

Formatted Output

6

Processor Output

<?xml version="1.0" encoding="UTF-16"?>6

See Also

Reference

XML Data Types Reference