How to unmarshal when you don't know what you're unmarshalling?

[Ron Cecchini]

Hey, all.

I have a route that's sitting on a port and it can receive 1 of 2 different XML 
messages.

I was simply going to try to unmarshal with the first one, and if it errors, 
unmarshal with the next one.

But is there a smarter or best practices way to handle this?

Thanks.