Resumen
The two aspects of new-generation middleware, dynamic customizability and high-level abstractions, illustrate fundamental themes for a new generation of middleware likely to be available to programmers within this decade. Dynamic customizability provides the flexibility required to adapt the middleware for resource-aware mobile applications. High-level abstractions simplify the problem of expressing complex interaction patterns by enabling application developers to specify interactions. By dynamically composing protocols in the middleware, application developers can thus address the problem of dynamic execution environments. The result will be the seamless integration of the physical world and the computational world, where every physical object is computationally active and networked. Moreover, physical devices will be more useful because their software will be able to adapt their execution environments to improve their utility while maximizing their energy efficiency.