Unified dialogue management in the carousel system

  • Authors:
  • Erik Sandewall

  • Affiliations:
  • Linköping University, Linköping, Sweden

  • Venue:
  • POPL '82 Proceedings of the 9th ACM SIGPLAN-SIGACT symposium on Principles of programming languages
  • Year:
  • 1982

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Abstract

The paper describes the design for a software environment which unifies the dialogue management support of a number of existing software tools, such as command-language handlers, operating-system shells, transition diagram interpreters, and forms management systems. The unification is accomplished without undue complexity: the resulting design is clean and inspectable.A key notion in the design is the use of three orthogonal abstraction hierarchies, for interaction contexts, for interactive operations (roughly = commands), and for data types. These orthogonal hierarchies are used for obtaining multi-dimensional inheritance, i.e. mappings of several arguments, which may be stored in the system's data repository, and which inherit their values along the hierarchies represented in the arguments. Mappings with multi-dimensional inheritance are used in the invocation mechanism, i.e. for selecting the appropriate procedure to be executed in various situations. Currently used programming languages and software tools only use single-dimensional inheritance.A working implementation called the CAROUSEL system, is available.