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Simple function
File: Query.xquery
declare namespace math = "http://java2s.com";
declare function math:add($op1 as xs:integer, $op2 as xs:integer) as xs:integer
{
$op1 + $op2
};
declare variable $op1 as xs:integer := 1;
declare variable $op2 as xs:integer := 2;
<add>
<op1>{$op1}</op1>
<op2>{$op2}</op2>
<result>{math:add($op1, $op2)}</result>
</add>
Output:
<?xml version="1.0" encoding="UTF-8"?>
<add>
<op1>1</op1>
<op2>2</op2>
<result>3</result>
</add>
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