Re: AS2 Orchestration

That correlation should work.  You can probably get by without an MDN schema.  You can use xpath to pull data out of the message without having a schema.  If you need to pull out lots of different fields, then it might be advantageous to define a schema with some distinguished fields and use those to extract the data.  If you want to validate the MDN, then that would be a reason to have a schema.  Otherwise, no schema is fine.