TFS merging for Orchestration/Map files

Has anyone worked on the code merging of odx and btm files? i believe both the file are xml but they will have guids for each of the shapes and have the xml structure for the process flow we define.

so the question here is that, is code merging possible for BizTalk projects. definitely some body would have tried. any thoughts/pointer are welcome?

Thanks,
Manjunath