tailieunhanh - Báo cáo khoa học: "Structures in XSEL"

There ~re two main phases to XSEL's processincj, a fact gathering phase and a component select=on phase. During the fact gathering phase XSEL carries on an interactive dialog with the salesperson to elicit values for facts that determine the customer's functional computing requirements. These might systems capture the knowledge needed to solve real-world problems in their respective domains, and that knowledge can and should be exploited for testing computational procedures for natural language processing. . | ExplanaiStructures in XSEL Karen Kukich Computer Science Department Carnegie-Mellon University Pittsburgh. PA 15213 412-578-2621 Kukich@CMU-CS-A 1. Introduction Expert systems provide a rich testbed from which to develop and test techniques for natural language processing. These systems capture the knowledge needed to solve real-world problems in their respective domains and that knowledge can and should be exploited for testing computational procedures for natural language processing. Parsing semantic interpretation dialog monitoring discourse organization and text generation are just a few of the language processing problems that might take advantage of the pre-structured semantic knowledge of an expert system. In particular the need for explanation generation facilities for expert systems provides an opportunity to explore the relationships between the underlying knowledge structures needed for automated reasoning and those needed for natural language processing. One such exploration was the development of an explanation generator for XSEL which is an expert system that helps a salesperson in producing a purchase order for a computer system 10 . This paper describes a technique called link-dependent message generation that forms the basis for explanation generation in XSEL. . Overview of XSEL Briefly the function of the XSEL system is to assist a salesperson in configuring a custom-tailored purchase order for a Digital Equipment Corporation VAX computer system. XSEL works with the salesperson to elicit the functional computing requirements of the individual customer and then goes on to select the components that best fit those requirements. The output of an XSEL session is a purchase order consisting of a list of line-items that specify hardware and software components. There are two main phases to XSEL s processing a fact gathering phase and a component selection phase. During the fact gathering phase XSEL carries on an interactive dialog with the .