_simpleTypes = new Hashtable();
_elements = new Hashtable();
_groups = new Hashtable();
_importedSchemas = new Hashtable();
_includedSchemas = new Vector();
_namespaces = new Namespaces();
_redefineSchemas = new Hashtable();
_cachedincludedSchemas = new Hashtable();
_schemaNamespace = schemaNS;
if (_schemaNamespace == null) {