An appliance development toolkit includes access to a user interface domain data model, access to an appliance user domain data model, a model instance editor configured to create one or more instances of user interface domain data derived from the user interface domain data model, to create one or more instances of appliance user domain data derived from the appliance user domain data model, and to associate one or more user interface elements with one or more appliance user elements. The toolkit also has a model instance converter for creating content including portions of the instances of user interface domain data, instances of appliance user domain data, and a map of the association. The content is in a builder file. An appliance can use the builder file at runtime to dynamically render its graphical user interface.