xquery Getting started with xquery Sum over values

Example

Given the following XML document :

<?xml version="1.0" encoding="UTF-8"?>
<values>
  <value>1</value>
  <value>3</value>
  <value>5</value>
</values>

We can produce an XML document describing the sum of the values with the following XQuery :

<total>{sum(/values/value)}</total>

Which will result in the following document :

<?xml version="1.0" encoding="UTF-8"?>
<total>9</total>