public void marshal(Object object,
HierarchicalStreamWriter writer,
MarshallingContext marshallingContext) {
FactHandle fh = (FactHandle) object;
writer.startNode( "external-form" );
writer.setValue( fh.toExternalForm() );
writer.endNode();
}
public Object unmarshal(HierarchicalStreamReader reader,
UnmarshallingContext unmarshallingContext) {