A graphical programming environment for switching software

A switching software design method aimed at substantially enhancing software productivity is described. The method, called DDL (data-driven logic), adopts a graphical programming technique using a dataflor graph for software representation. An execution mechanism for instructions in a dataflow graph is based on the data-driven rule. This method provides the advantages of easy design and reusable software components. A DDL graphical language specification is presented along with a DDL graphical development environment, and an evaluation of the DDL call-processing program, applied to a commercial PABX system.<
>