By Henry Lieberman (auth.), Christophe Kolski, Jean Vanderdonckt (eds.)

Advances in electronics, communications, and the short development of the web have made using a wide selection of computing units an each­ day incidence. those computing units have diversified interplay types, input/output ideas, modalities, features, and contexts of use. moreover, clients anticipate to entry their information and run a similar program from any of those units. of the issues we encountered in our personal paintings [2] in development VIs for various structures have been the several format beneficial properties and display sizes linked to every one platform and equipment. Dan Ol­ sen [13], Peter Johnson [9], and Stephen Brewster, et al. [4] all discuss difficulties in interplay as a result of the variety of interactive systems, units, community companies and purposes. additionally they discuss the issues associ­ ated with the small monitor measurement of handheld units. compared to table­ best desktops, handheld units will continuously be afflicted by an absence of monitor genuine property, so new metaphors of interplay must be devised for such de­ vices. it's tricky to enhance a multi-platform person interface (VI) with no duplicating improvement attempt. builders now face the daunting job to construct UIs that needs to paintings throughout a number of units. there were a few ap­ proaches in the direction of fixing this challenge of multi-platform VI improvement in­ cluding XWeb [14]. development "plastic interfaces" [5,20] is one such strategy within which the VIs are designed to "withstand diversifications of context of use whereas protecting usability".

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It determines when to invoke event handlers to parse and reformat data values during updates in each direction. The WSXL control component reads declarations authored in an XLINKbased extensible control language specification to establish required arcs and implements the processing model for initiating, sequencing, and carrying out updates to synchronize the presentation with the state of the data. A second function of the control component is to manage the macro-control involving instantiation of entirely new data and presentation components as a user WXSL: A Web Services Languagefor Integrating End-User Experience 39 moves through the application.

In addition, we generalize the role of the control channels as a way to dynamically express Quality of Service. Although our model of context and contextors needs to be evaluated against large scale applications, it sets the foundations for a systematic approach to context-aware computing. ACKNOWLEDGMENT This work has been partly supported by the EEC project TMR TACIT (ERB-FMRX-CT-97-0133) and by the FET GLOSS project (lST-200026070). It has been conducted with the participation of G. Calvary, P.

The operator can select the switched battery via three push-buttons. Fig. I b shows the user interface layout. When a switched battery level is below 10% of its initial capacity, the percentage is replaced by a low warning me8sage. , the interface state must display exactly the functional core state. This last requirement deals with the usability of the system. 54 Jambon This case study is an elementary safety-critical process-control system: the operator can control side-effects on hardware -the switches- whereas the hardware state -the batteries levels- is altered asynchronously.

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