Modules and Updatable Graph Views for PROgrammed Graph REwriting Systems

Speciication and rapid prototyping of graph manipulating software by means of PROgrammed Graph REwriting Systems (PROGRES) is a paradigm, which attracts more and more interests in various elds of computer science. Nowadays produced speci-cations for process modelling tools, database query languages, or Conceptual Graph manipulations have a typical size of about 100 printed pages. They suuer severely from the lack of any graph rewriting system module concept. As a rst remedy, we have just developed a module concept in the avor of Modula-2 for our graph rewriting language and system PROGRES. It supports a variety of programming-in-the-large styles, including the construction of Abstract Graph Types. Having made the experience that \full data abstraction" is in connict with the visual programming paradigm of PRO-GRES, we are now starting to add active database system concepts for the construction of updatable abstract graph views.