ActionScript 2.0 Language Reference - Adobe Help and Support

Example
The following example creates a very simple XML object and outputs the result of a call to the
getPrefixForNamespace() method. The Outer XML node, which is represented by the
xmlDoc variable, defines a namespace URI and assigns it to the exu prefix. Calling the
getPrefixForNamespace() method with the defined namespace URI ("http://
www.example.com/util") returns the prefix exu, but calling this method with an undefined
URI ("http://www.example.com/other") returns null. The first exu:Child node, which is
represented by the child1 variable, also defines a namespace URI ("http://
www.example.com/child"), but does not assign it to a prefix. Calling this method on the
defined, but unassigned, namespace URI returns an empty string.
function createXML():XMLNode {
var str:String = ""
+ ""
+ ""
+ ""
+ "";
return new XML(str).firstChild;
}
var xmlDoc:XMLNode = createXML();
trace(xmlDoc.getPrefixForNamespace("http://www.example.com/util")); //
output: exu
trace(xmlDoc.getPrefixForNamespace("http://www.example.com/other")); //
output: null
var child1:XMLNode = xmlDoc.firstChild;
trace(child1.getPrefixForNamespace("http://www.example.com/child")); //
output: [empty string]
trace(child1.getPrefixForNamespace("http://www.example.com/other")); //
output: null
See also
getNamespaceForPrefix (XMLNode.getNamespaceForPrefix method), namespaceURI
(XMLNode.namespaceURI property)
XMLNode 1345