Provide a Session.validateMessageBody() method to only validate the body of the message without header or trailer parts.

What do you think of adding another method to quickfix.Session that allows to check if just the body of the message is valid?

I can see the use cases being where a quickfix message is created (a new order single, a reject, etc) and may need to be validated in the application layer before sending it out on the wire (where it potentially gets validated as well by QFJ itself).

However, it's hard to do that since the header and trailer information are injected into the message by QFJ. And while you can set almost anything, the CheckSum is hard to calculate; and it seems silly to duplicate the effort.

Any thoughts? What do you guys think?