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