I have created a playlist of videos which collectively demonstrate the use of the Openbox to specify a variety of Single Feature Representation Systems.
The basic idea is to describe a particular SFIS using an XML file to specify the sets of roles and values that make up the features. These specifications can be augmented with a further specification of the realization of the representation: what the representation looks like when drawn on the screen. The same SFIS might be realized in different ways - the logic is the same, but the cognitive affordances of particular realizations are different.
You can see the videos here.