XML_Util::splitQualifiedName() -- split qualified name
 Description
        Splits a qualified name and returns array with namespace and local part.
     
Parameter
    
       string $qname - qualified tag name (e.g. xsl:stylsheet)
      
       string $defaultNs - default namespace, will be used in return value, if qualified name contains only a local part
      
    Return value
      array assoc array containing namespace and local part of the tag
    
Note
This function should be called
statically.