An E-LOTOS specification of the computational viewpoint of the ODP trader is presented. E-LOTOS is a new FDT being standardized in the ISO ODP framework. The trader specification is on one hand an assessment of the capabilities of E-LOTOS in specifying ODP elements, but is on the other hand an introduction to the most relevant features ofE-LOTOS. E-LOTOS maintains the spirit and the most fundamental operators of LOTOS. It has includes a new functional data typing language, as well as a rich set of new elements such as time, exception handling, a generalized sequential operator, a more general parallel composition operator, gate typing, partial synchronization, ...
Abstract. We propose a set of algebraic laws for reasoning with sequential imperative programs that use object references like in Java. The theory is based on previous work by adding laws to cope with object references. The incrementality of the algebraic method is fundamental; with a few exceptions, existing laws for copy semantics are entirely reused, as they are not affected by the proposed laws for reference semantics. As an evidence of relative completeness, we show that any program can be transformed, through the use of our laws, to a normal form which simulates it using an explicit heap with copy semantics.
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