DataObject lastNameProperty = customerType.createDataObject("property");
lastNameProperty.set("name", "lastName");
lastNameProperty.set("type", stringType);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
xmlHelper.save(customerType, "commonj.sdo", "type", baos);
ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
XMLDocument xdoc = xmlHelper.load(bais);
customerType = xdoc.getRootObject();