The cache processing section performs {HEAD ~ a cache process} composed of {TAIL ~ two stage processes}, a query process and a subsequent process  
The cache processing section performs { HEAD ~ a cache process } composed of { TAIL ~ two stage processes } , a query process and a subsequent process
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH