s value must be a namespace
prefix that maps to the same namespace URI as the prefix used in the extension function
call.</p>

<p>The <b>src</b> attribute is mandatory for language="java", its value must take the
form "java:fully.qualified.class.Name", for example "java:java.util.Date". It defines
the class containing the implementation of extension functions that use this prefix.</p>

<p>The <b>archive</b> attribute is optional, its value is a space-separated list of URLs
of folders or JAR files t