The Expires header may report when {HEAD ~ a multimedia content} or a description file of {TAIL ~ a multimedia content} expires 
of
The Expires header may report when { HEAD ~ a multimedia content } or a description file of { TAIL ~ a multimedia content } expires
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH