le, you want to use unique strings as keys
in a dictionary object. Not having a string representation also makes it
difficult to specify a namespaced identity outside the context of an XML
document.
</p>

<p>In order to pass namespaced values to transformations,
for 
instance when setting a property or a parameter on a 
{@link javax.xml.transform.Transformer} object,
this specification defines that a
String "qname" object parameter be passed as two-part string, the namespace URI
enclosed in curly braces ({}