Investigating Miraculous Specifications
نویسنده
چکیده
In order to use expressions as the basis of a specification language, we admit undefinedness, and introduce nondeterminism through the use of a choice operator. We extend expressiveness of the language by allowing choice from a set of values. Such a set could be infinite, giving unbounded non-determinism, or it could be empty, producing miracles. In this paper we treat the miraculous specification, examining its uses and highlighting related problems. In particular, we find that miracles promote the possibility of specification in parts, and piecewise refinement. However, their undesirable properties mean that we must limit their use. A biased choice operator is introduced as a method of totalising miraculous expressions. Finally, the formation of miraculous functions is considered with reference to their use and manipulation.
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تاریخ انتشار 1998