[ogsa-wg] WSRF - enumerating resources

Hello, I have a general question about WSRF and I hope this is the correct place to make it (if not, please tell me where should I ask) How can I retrieve the list of all the Resource instances of the same type? (In WBEM/CIM it would equival to do a enumerateInstances() operation). Maybe should I create a service group, and then do a query() ? Thanks for any help. -Enric