[This message was posted by Mahesh Kumaraguru of  <[email protected]> to the 
"General Q/A" discussion forum at http://fixprotocol.org/discuss/22. You can 
reply to it on-line at http://fixprotocol.org/discuss/read/91c92668 - PLEASE DO 
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You are right, the underlying logic of Logon request, Logon response, 
TestRequest, Heartbeat, is same. Some tags / values are different between 
FIX.4.0 / 4.1 / 4.2 and FIXT.1.1 introduces new structure because of transport 
indenpendence.

You will discover many interesting things writing both the initiator and 
acceptor. A lot of code is common between these.

Were you able to use the zip file to know differences between messages in 
different versions ?

> My intention is to do both, initiator and acceptor. I have some
> networking code working as well.
> 
> I'd like to get back to difference in versions again. You mention that
> various versions are quite different, even at the session level. My
> assumption that the number and type of tags might change, but the
> underlying logic is the same. For example,(Acceptor) waits for logon
> message, check checksum, deal with testrequests or resend requests, etc.
> 
> Am I wrong in assuming that the underlying protocol (sequence numbers,
> message flow/semantics) remains the same, but different version
> add/remove messages and add/remove/modify fields?
> 
> I had a little trouble figuring out how to use the xmls in the zip file
> you provided.
> 


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