compatibility issues

Imported from previous forum

Hello,

I am wondering if it is possible to implement my
FIX server that supports multiple versio of FIX
specs.

Right now I parse and validate all FIX messages,
the problems of the parser is that I don’t yet know if it is possible to look at the FIX message
then determine which DTD to use to validate the message-- I pretty much have to pick a DTD to start with. The questions now becomes: which DTD to use if multiple FIX versions are supported.

Your inputs are very appreciated.

Jimmy