Implement base64binary type. Most of the work is done in the superclass.
This only needs to implement the unparsing.
author: Dave Reynolds version: $Revision: 1.11 $ on $Date: 2008/01/02 12:10:49 $
Constructor.
Parameters: typeName - the name of the XSD type to be instantiated, this is used to lookup a type definition from the Xerces schema factory.