DDS Logical - Omit Pos 17 and ALL

[jstevens@xxxxxxxxxxxxxx]

I have an old logical file that I'm trying to understand.  There are some 
selects on it - that's not the issue.  The issue is the "Omit" - "O" in 
position 17, and the ALL keyword in the functions (column 45).

Here's what the DDS manual says about it...
If you do not specify the ALL keyword, the action taken for the records 
that do not meet the values is
the converse of the type of the last statement specified. Records that do 
not meet selection values are
omitted, and records that do not meet omission values are selected.


The code is like this...
...
     A          S CHWARN                    COMP(EQ 'C')
     A            CHSDAT                    COMP(NE 0)
     A            CHAMT                     COMP(NE 0)
     A          O                           ALL 

Well, I not understanding what the manual is saying, so, my question is - 
What's the last line for?  And, what's the ALL Keyword for?

Thanks!

Jeff Stevens
Mize, Houser & Co. P.A.
913 451 1882
JStevens@xxxxxxxxxxxxxx