Date Added: Jul 2009
Researchers have developed a large variety of semantic models of object-oriented computations. These include object calculi as well as denotational, small-step operational, big-step operational, and reduction semantics. Some focus on pure object-oriented computation in small calculi; many others mingle the object-oriented and the procedural aspects of programming languages. In this paper, the authors present a novel, two-level framework of object-oriented computation. The upper level of the framework borrows elements from UML's sequence diagrams to express the message exchanges among objects.