2 - 14 A-41069 January 1993
Three level offset indexing When using this scheme, the Image Address ( IA) assigned to each
document is defined as follows:
• Field A (Level 1) is defined as having a field length of zero.
• Field B (Level 2) is defined as having a field length greater than zero.
• Field C (Level 3) is defined as having a field length greater tha n zero.
• Fixed Field may be d efined, if desired.
Let's use the scanning of a book as an ex ample. Assume that the book
contains two distinct sections; Section On e contains two chapters, each
having forty (40) pages; Section Two con tains only one chapter, having
one-hundred twenty (120) pages.
The Image Address has been defined:
• Field A has zero ( 0) characters.
• Field B has two (2) characters.
• Field C has one (1) character.
• Fixed Field has zer o (0) characters.
Example of three level offset
indexing