[This message was posted by Joseph Gisana of  <[email protected]> to the "FAST 
Protocol" discussion forum at http://fixprotocol.org/discuss/46. You can reply 
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Rolf,
so we have an optional delta string.
The cache has AB
subtraction length on wire is 0x81 which is subtraction length 1
string on wire is 0x80 which is string 0x00
If I understand this correctly the result should be A
Thanks, Joseph
> Joseph,
> 
> no, the value in the previous value cache should not be used. yes, it
> would be an error if the field was not optional.
> 
> /Rolf
> 
> > Rolf, Thanks I missed that in the spec. You are correct it is
> > optional. Does this mean if there was a value in the cache that I
> > should use it? Say the field was not optional and subtraction length
> > was zero would this be an error?
> >
> > Thanks, Joseph
> >
> >> Joseph,
> >>
> >> Is it an optional string delta field?
> >>
> >> If so, a zero (0x80) byte would indicate a NULL field. There is no
> >> string value following in the NULL case. [see spec section 10.7.3]
> >>
> >> Hope this helps, Rolf


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