These approaches however fall short in that they are either incapable of capturing nonfunctional requirements or are non-evolutionary in response to the changes in functional and nonfunctional re-quirements of the ever-changing domain of ubicomp. The efforts in providing an integration framework for these services employs software product line engineering to capture variations and commonalities across these services. The domain of ubiquitous computing is flooded with a vast number of services, which although share similar functionalities, fail in easy integration and composition. ![]() We find that it is relatively simple to build and extend applications on ADS that make using digital devices easier, which results in the devices themselves becoming more useful. We evaluate our implementation of the ADS architecture based on these principles, and build applications using the ADS framework to evaluate the ease with which appliance computing applications can be built using the framework. Based on this vision, we formulate three principles that guide the design of an architecture that helps realize this vision: bring devices to the forefront, minimize the number of device features, and place functionality in the network infrastructure. The Appliance Data Services project seeks to explore a vision of an appliance computing world where users move data seamlessly among various devices. This lack of infrastructural support makes input-centric devices hard to use and less useful. However, the same type of support is lacking for input-centric devices, those that create content and allow users to share content. For example, mobile users can retrieve Web content using handheld devices since content retrieval is well-supported by infrastructure services such as transformational proxies. Digital appliances designed to simplify everyday tasks are readily available to end consumers.
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