By Frank Rößler, Birgit Geppert, Reinhard Gotzhein (auth.), Edel Sherratt (eds.)
This publication constitutes the completely refereed post-proceedings of the 3rd foreign Workshop on SDL and MSC, SAM 2002, held in Aberystwyth, united kingdom in June 2002.
The 15 revised complete papers offered have been conscientiously chosen in the course of rounds of reviewing and revision. A vast number of present matters on SDL and on MSC and TTCN are addressed, specifically languages for collaborative specification, visible specifications description, constraints in SDL, SDL extensions, protocol layout, UMS protocol implementation, use case map situations, message series charts, MSC connectors, MSC-2000 extensions, and TTCN-3 in terms of UML and MSC.
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Example text
Such systems, of various sizes and natures, include wireless or IP-based telecommunication systems, e-commerce and Web applications, and other types of distributed, embedded, or reactive systems. The creation of a standard such as URN is not without challenges. Among others, three important aspects of future requirements engineering techniques will be a) the ability to capture goals and decision rationale which shape the resulting system, b) the ability to seamlessly move from analysis models to design models, and c) the ability to model dynamic systems where behaviour and structures may change at run-time.
An alternative means is to use a hierarchical system of priorities which allows replacement of an explicit scheduler in a very simple manner. Obviously when taking into account scheduling, the enabling condition of the transition exiting each atomic step, which constrains the duration of the step, must allow to take into account the time passed in the state “suspended”; that is, in Fig. 2, if the interval [2,3] constrains the execution time and not the overall duration of the step, the condition 2≤(now-x)≤3 should be replaced by 2≤((now-x)–durationsusp)≤3.
The intermediate steps can occur at any time, but not later than the time corresponding to the maximal overall duration, and the last step must additionally make sure that the overall sequence of steps takes at least the required minimal duration. This does not exclude the sequence where the duration has reached its maximal value already in the starting state s1; just time will not progress any further until the end of the sequence. This is especially interesting when the intermediate states are considered as “unobservable” for verification and can altogether be identified with state s1.
