A user-interface of a device renders a first object and a second object, each object with data of a business application. The device is either of a first type or of a second type. In the device, an interpreter receives an application specification document with a statement. The statement indicates to render the first and second objects in an assembly. The interpreter identifies a presentation pattern for the assembly from predefined first and second presentation patterns according to the type of the device so that the assembly is rendered according to the presentation pattern.