The computer program product 18, wherein the persistent federated folder contains {HEAD ~ members} from {TAIL ~ an entity} of the persistent federated folder 
from
The computer program product 18 , wherein the persistent federated folder contains { HEAD ~ members } from { TAIL ~ an entity } of the persistent federated folder
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH