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.

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