I figured out how to do this. It's pretty straightforward....
The plotter can hold a list of restrictions, e.g.:
<d3:MaximalSizeRestriction MaxSize="75" />
Each restriction can enforces some limit on some property, so you have to understand the property it limits in order to know which properties to set in the Restriction.
For example, the maximalsize restriction limits the dimension of the viewport to 75.