Not sure what you're looking for. Make a call to any of the APIs and you'll see quite a bit in the return data. There's no published list of the various columns associated with the different data elements. The APIs give some hints just in what is available to call for, and like I said the data returns will show you quite a bit of what is available.
The data structures aren't particularly well documented, and this is in part due to the fact that it is subject to change.