Manual clarification

[John Hasler <..hidden..>]

On page 47 of the manual I find:

   <%if not varname%> tells the parser to ignore include the next block
   only if varname was posted by the submitting form (or set via the form
   hash elsewhere in the scripts).
   ...
   <%if varname%> tells the parser to ignore the block if varname was not
   posted in the submitting form (or set via the form hash elsewhere in the
   scripts).

What are you trying to say here?
-- 
John Hasler 
..hidden..
Elmwood, WI USA