ht.put("fixed", new mNumber( "fixed" ));
ht.put("ISODate" , new ISODate());
ht.put("ISOTime" , new ISOTime());
ht.put("ISODateTime" , new ISODateTime());
ht.put("ISO8601" , new ISO8601());
ht.put("uriReference", new uri());
ht.put("uri", new uri());
ht.put("positive-integer",
createXMLIntegerType("positive-integer"));
ht.put("non-positive-integer",
createXMLIntegerType("non-positive-integer"));
ht.put("negative-integer",