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The delivery of multimedia content often needs the adaptation of the content in order to satisfy user con-straints. With the Digital Item Adaptation part, the MPEG-21 standard already defines a useful frame-work to handle this task. However, when the function-ality of adaptation is split over several services the central instantiation of a suitable service chain needs to tackle a complex multi-objective optimization prob-lem. In this problem between content choice and possi-ble adaptations the current preference model in the MPEG-7/21 standard still lacks expressiveness. In the course of this paper we demonstrate this shortcoming and how the integration of more powerful models can ease the instantiation problem. As a running example we use a typical media streaming application with Web services as basic modules. We will let a central coor-dinator instantiate a service composition by integrat-ing all needed Web services to adapt the multimedia content in the best possible fashion.