[This message was posted by Rolf Andersson of Pantor Engineering 
<[email protected]> to the "FAST Protocol" discussion forum at 
http://fixprotocol.org/discuss/46. You can reply to it on-line at 
http://fixprotocol.org/discuss/read/24551b98 - PLEASE DO NOT REPLY BY MAIL.]

Michael,

It feels like I'm repeatedly paraphrasing the FAST spec to answer your 
questions. May I suggest that you read the spec, describe how you interpret it 
for you use cases and then ask any questions that you might have regarding 
specific sections of the spec.

/Rolf

> Rolf,
> 
> Let's say there is a field is optional. operator is tail. field
> type is string and no initial value. Then when I recevie 0x80
> which means is null value, how to proceed?
> 
> Here is another case. There is a field is optional and the operator
> is constant. If the pmap bit is set, should the value appear in the
> stream or just use the default value?
> 
> BTW Can I say that the initial value is used if the field is absent
> no matter what operator is?
> 
> Michael


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