I've added Doxygen documentation to most of Dataspace lib now. Maybe this is useful for you, Casey, if you want to use Dataspacelib as a model for creating new extensions.
There are a few TODOs left in TTDataspace.h, TTDataspaceConverter.h and TTDataspaceUnit.h. These were aspects of the code that I didn't fully understand. Tim, would you be kind to look into these TODOs? I believe documenting them is important for helping new developers getting a full understanding of all of DataspaceLib, and hopefully it shouldn't take long.