The ModelService class provides an entry point for the editing model and for global event notifications. ModelService is provided by the serialization engine and is used to gain access to the model.

In addition to the ModelService, the designer must map visuals to underlying model items. A 1:1 mapping between a visual and a model item is not required, but there must be an association between visuals and model items. The ViewService class fulfills this role.

The ModelService and ViewService classes are required for the designer to function. The DesignerView class, which is responsible for processing user input and routing it to commands, requires both of these services to map user input back to the model.

The public methods of ModelService can be called by any code. The protected methods are invoked by the editing model.

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