From: PKIS: practical keyword index search on cloud datacenter
Index
Identifier of document
f k c ( f i k 1 1 ( w n , 1 ) )
f k c ( d 1 )
f k c ( f i k 1 1 ( w 1 , 2 ) )
...
f k c ( f i k 1 1 ( w 1 , t ) )
f k c ( f i k 1 2 ( w 2 , 1 ) )
f k c ( d 2 )
f k c ( f i k 1 2 ( w 2 , 2 ) )
f k c ( f i k 1 2 ( w 2 , t ) )
f k c ( f i k 1 1 1 3 ( w 1 1 4 , 1 ) )
f k c ( d 1 1 4 )
f k c ( f i k 1 1 1 3 ( w 1 1 4 , t ) )
f k c ( f i k i s ( w n , t ) )
f k c ( d n )