[Data Retrieval] data set [Information Retrieval] sections or documents [Knowledge Retrieval] a set of knowledge unit [0] 
Retrieved Results
M a t c h
I n f e r e n c e
M o d e l
Q u e r y
O r g a n i z a t i o n
R e p r e s e n t a t i o n
S t o r a g e
R e t r i e v e d R e s u l t s