* <code><nowiki>"http://www.w3.org/2005/xpath-functions/math":pi()</nowiki></code> returns the number π
* <code>"java:java.io.FileOutputStream":new("output")</code> creates a new Java file output stream
Note that the current syntax may soon be replaced by the so-called [http://www.jclark.com/xml/xmlns.htm Clark Notation] and the letter {{Mono|Q}} as prefix:
* <code><nowiki>Q{"http://www.w3.org/2005/xpath-functions/math"}pi()</nowiki></code> returns the number π
* <code>Q{"java:java.io.FileOutputStream"}new("output")</code> creates a new Java file output stream
==Namespace Constructors==