I need to create a report definition XML file for a project I am working on.

I'm working mainly off the examples at..


...but I do not know what each of the elements and attributes in the example represent and therefore don't know how to define them for our purposes. Is there a document somewhere explaining the purpose of each of these elements and their attributes? If not when might something like this be available and is there any document that might get me somewhat closer to figuring out how to put this file together?