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1 2005

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A graphical tabular model for rule-based logic programming and verification

Nalepa G. J., Ligęza A.

Systems Science

2005

Vol. 31, no 2

89-95

New trends in the development of databases and expert systems seem to underline the role of graphical specification tools, visual information modeling and formal verification procedures. This paper incorporates these new ideas and, moreover, tries to present putting them in engineering practice. The main goal is to move the design procedure to a more abstract, logical level, where knowledge specification is based on use of abstract rule representation, called eXtended Tabular Trees. The main idea behind XTTis to build a hierarchy of Object-Attribute-Value Tables (OAV table). The basic component for knowledge specification is an OAV table. It is analogous to a relational database table; however, it contains conditional part and decision columns. Moreover, the attribute values can be non-atomic ones. Each row provides specification of a single rule. The OAV tables can be connected with one another through appropriate links specifying the control flow in the system. The design specification is automatically translated into Prolog code, so the designer can focus on logical specification of safety and reliability. On the other hand, formal aspects such as completeness, determinism, etc., are automatically verified on-line during the design, so that its verifiable characteristics are preserved. From practical point of view, the design process is performed with an intelligent tool named Mirella.