SimpleTypesFactory provides code constants for every built in type defined in www.w3.org/TR/xmlschma-2-20000407 USER_TYPE is used for user derived types. This factory can also create instances of classes derived from SimpleType that represent the simple types defined by xmlschema and those derived from them.
@author
Arnaud Berry
@version $Revision: 7951 $ $Date: 2006-04-25 15:08:23 -0600 (Tue, 25 Apr 2006) $