public void addCustomAttribute(String name, String value) {
if (name == null || value == null
|| name.length() == 0 || value.length() == 0)
throw new IllegalArgumentException();
final ExValue ev = new ExValue(value, Object.class);
if (_custAttrs == null)
_custAttrs = new HashMap(4);
_custAttrs.put(name, ev);
}