XQuery/Using the Math Module

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Motivation[edit]

You want to use basic math functions directly within your XQuery program.

Method[edit]

We will use the XQuery module function that is available for eXist.

Configuring eXist[edit]

You must first make sure that the math module is enabled in your version of eXist. To do this make sure the following lines are uncommented in your $EXIST_HOME/conf.xml file:

<module class="org.exist.xquery.modules.math.MathModule"
                uri="http://exist-db.org/xquery/math" />

If you make a change to the file you will need to restart eXist.

Listing of Math functions[edit]

You can now just reference any of the math functions in the math module.

Here is a list of all the functions:

http://demo.exist-db.org/exist/functions/math

Sample Program[edit]

Here is a sample XQuery program:

xquery version "1.0";
 
<results>
   <abs>{math:abs(-3.1)}</abs>
</results>

Results[edit]

<results>
   <abs>3.1</abs>
</results>