Phrase-based Subject Index Interface

th at d o cu m en t). In th is case, the text abo v e th e low er pan el s h ow s that the p hr as e fo res t pr o d u cts app ear s in 72 p hr as es (the f irs t ten are s h ow n) , in 3 82 d o cu m ents. Th e f ir s t ten o f th es e are av ailable too , tho u g h th e lis t m u s t b e s cr o lled d o wn to m ak e th em ap p ear in th e v is ible par t of th e p an el. F igu r e 4 s h o ws this. In ef fect, th e pan el s h o ws a ph r as e lis t f o llo w ed b y a d o cu m en t lis t. Eith er of thes e lis ts m ay be n u ll (in f act th e d o cum en t lis t is n ull in th e u p p er p anel, b ecau s e w e are n ot in ter es ted in s in gle wo r d s , lik e fo res t, b ecau s e th ey ar e eq u ivalen t to a f u ll text s ear ch fo r fo res t). Th e d o cum en t lis t d is play s th e titles o f th e do cu m en ts. I t is p os s ib le, in b o th p anels of F igu r es 3 and 4 , to click G et m o r e p h r as es to in creas e th e n u m b er o f p h r ases that ar e s h o wn in th e lis t o f p hr as es. I t is als o po s s ible, in th e lo wer p an els , to G et m o r e d o cum en ts to in creas e th e n u mb er …