Model role is part of the solution to drive a drawing style output, the other part is the model object, a parameter inside the drawing style system that can be used to control the presentation of an object that can be a series of model roles combined under a model object.
also the model object is used to drive the drawing process manager, as part of the detail style map, that when you set a model object, this links to the model role/s and the style used is linked to the model object.
when a process is used to create drawings, the system works though the detail style map and when it comes to the model object, and the style set under that, that is the style associated with the element from the model.
https://m.youtube.com/watch?v=DJfsAUcDrV4
John Bennett
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