MPXJ - get ResourceAssignment baseline values

I'm try开发者_如何学Pythoning to display the Baseline Start, Finish, Cost, and Work values for a ResourceAssignment, but cannot seem to find any methods on the ResourceAssignment object that would provide this information. Anybody know if this is possible?

I know the information is stored because I can see it in MS Project, and I can see it in the XML version of the project file. Just can't see in the API where to get access to it.

In case anybody cares, Jon has fixed this in the latest version of the MPXJ source code. You can see the bug request here.