[This message was posted by Thomas Schultz of Lind-Waldock & Company LLC 
<[EMAIL PROTECTED]> to the "FAST Protocol" discussion forum at 
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I understand that the state of the previous value is not to be changed when a 
null is received.  But, should the value be output, i.e., is the field active?  
If it is not, then it seems to me that the previous value really has four 
states, undefined, assigned, empty and inactive (assigned, but no field).

Section 10.5.1  "A NULL indicates that the delta is absent.  Note that the 
previous value is not set to empty but is left untouched if the value is 
absent."

I do not think the above statement from the specification is very clear as to 
what is to happen in this case.

Please straighten me out.  Thanks.

BTW: I was able to write a working decoder in about 12 working days.  Had the 
specification been clearer, better written with more examples, I could have 
done it in far less time.  I had to make myself a cheat sheet.  Somebody needs 
to reorganize/rewrite that thing.

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