=Math Module=
The math module defines extension functions to perform mathematical operations, such as <code>pi</code>, <code>asin</code> and <code>acos</code>. All functions are preceded by the <code>math:</code> prefix. Some of the functions have also been specified in the
[http://www.w3.org/TR/xpath-functions-11/ Functions and Operators Specification] of the upcoming XQuery 1.1 Recommendation.