In Orchard, the UI gets composed from many independent parts. We wrote a lot of code to handle that fact without friction. It is easy to add a new part or remove an existing one without breaking anything. One ingredient in this is the placement.info file . The role of placement is to dispatch the shapes that represent content types to local zones and to specify in what order they should appear. it separates the templates and their orchestration, implementing some healthy separation of concerns. It is quite powerful and flexible, but it represents a sort of inversion of control that can be quite puzzling to designers: we are used, in other systems, to the layout pulling the different "includes" that constitute it. With placement, the...(read more) ...
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