a subscription mechanism configured to send {HEAD ~ a subscription message} containing said information file specification to {TAIL ~ a notification mechanism} included within an information provider apparatus comprising a server computer executing a server application 
to
a subscription mechanism configured to send { HEAD ~ a subscription message } containing said information file specification to { TAIL ~ a notification mechanism } included within an information provider apparatus comprising a server computer executing a server application
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH