Re: [Quickfixj-users] Can DataDictionary be used to create messages?

[Joerg T. <Joe...@ma...>]

Hi Naresh,

On 03/29/07 14:48, Naresh Bhatia wrote:
> Just out of curiosity, are message types and field tags compatible between the various FIX
> versions? I understand that messages and fields may be added / removed between various versions,
> but is it possible that the same message can have a different MsgType or the same field can have
> a different field tag?

Actually, field tags are never removed, just deprecated. Sometimes the names change, ie from 
IDSource in FIX 4.2 to SecurityIDSource in FIX 4.4, but the tag value stays the same.

In addition, the tags are independent from the message type: The same tag value has the same meaning 
in every message which uses it.

So if you upgrade from one FIX version to the next, either a tag is continued to be used with the 
same meaning (possibly a changed name) or it is deprecated (not used any longer).

Hope that makes thing clearer for you.

Cheers, Jörg

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Joerg Thoennes
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