I have submited my part 2 and signed up for part 3. And noticed that I have possibly made a mistake in my assignment. I mean technically this is not a mistake. Not sure how the graders will look at this. Please advise what do you think?
I have designed the communication piece with the transmaster as following. I used JAXB to format XML-RPC messages and send them over HTTP. I also listed two XML schemas for request and response in my assumptions. I did not rely on any standard XML-RPC implementations. Will this be a problem in my design?
I really don't know. In my case, I don't specify the things in a such low level way, I just say every thing in high level and I gave the responsibility of defining the communication with TransMaster to the developer. One BIG mistake that you are doing is to use HTTP to communicate with TransMaster, you should use HTTPS.
Now all you need to do is relax, do the part 3 and wait.
In my humble opinion, it is not a mistake. I have done exactly this way in other application. You could use a XML bindind technology, like JAXB (or Castor) or you could use a parsing techonolgy (JAXP).