[This message was posted by Jeff Schmitz of  <[EMAIL PROTECTED]> to the "FAST 
Protocol" discussion forum at http://fixprotocol.org/discuss/46. You can reply 
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Hi FAST community, thanks for your assistance...

I don't see anywhere that delta encodings, such as ASCIIStringDelta are 
defined.  This grammar from section 10 is not complete:

stream ::= message* | block* 
block ::= BlockSize message+ 
message ::= segment 
segment ::= PresenceMap TemplateIdentifier? (field | segment)* 
field ::= integer | string | delta | ScaledNumber | ByteVector integer ::= 
UnsignedInteger | SignedInteger 
string ::= ASCIIString | UnicodeString 
delta ::= IntegerDelta | ScaledNumberDelta | ASCIIStringDelta | ByteVectorDelta

Specifically, I'm looking for the delta encodings.  ASCIIStringDelta, for 
example is referenced in 6.3.7.3:

"The delta value is represented as an ASCII String Delta in the transfer 
encoding. The subtraction length of the delta specifies the number of 
characters to remove from the front or back of the base value. Characters are 
removed from the front when the subtraction length is negative. The string part 
of the delta value represents the characters to add to the same end of the base 
value as specified by the sign of the subtraction length."

Specifically, is subtraction length a prefixed integer length, or is it the 
length of the delta string?

More generally, though, where are these formally defined (the transfer encoding 
link in the basic user's guide is broken)?

TIA

jeff


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