Model-driven Engineering of Active Context-awareness

...More generally, in [2] a model-driven approach for adaptive context-aware Web applications is presented...

...Context could also be used to eliminate the need for input altogether by performing implicit searches triggered purely by changes in context, although there are still cases where users will want to take over control of the system to perform explicit searches that may be entirely independent of their current context [1]...

...For example, in [6], UML class diagrams are used to model user, personalization, and context metadata subschemas together in one model...

...), as well as the introduction of customization modeling concepts (Ceri et al., 2007a...

...The framework leverages our previous results in the design of context-aware web applications [6,8] and in the component-based development of web applications [9,10]...
...Context components are in charge of monitoring the context and generating context events when the context changes [8]...
...For example, Ceri et al. [6] propose an extension of the WebML model, in which adaptive pages are associated with a chain of operations that implement the page’s adaptivity logic and are executed each time a context monitor [8] (which restricts the analysis of the context model to the only properties relevant to the currently viewed page) demands for adaptation...
...This therefore leads us to interpret context as an independent actor ,w orking on the same application as users do [8]...
...4 The described use of context components is fully in line with the idea of context monitor discussed in [8]...
...The location context component used in the case study is based on previous work [8]: it leverages a client-side Bluetooth GPS device, interfaced via the Chaeron GPS Library 6 , and is wrapped by means of Flash (to exchange posi-...

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