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  key = {Woodbury},
  author = {Jeffrey Guenther and Robert Woodbury and Chris Shaw},
  title = {Shiro - A Language for Describing Parametric Alternatives },
  howpublished = {GRAND NCE Annual Conference},
  month = {May},
  year = 2013,
  abstract = {Parametric systems have been used in CAD tools like Generative Components and Rhino + Grasshopper to
                   allow designers to construct geometry based on mathematical relationships. Designers have had great
                   success using these tools to create dynamic designs that take too long to draft using traditional CAD
                   tools. Parametric systems have also been applied to visual analytics tools to allow analysts to
                   manipulate and visualize data. Both designers and analysts work to solve ill-defined problems,
                   problems where there is no objective solution only a set of tradeoffs that must be balanced, and must
                   explore many possible solutions. Parametric systems allow problem solvers to change parameter values
                   and immediately see how the change affects their solution. Parametric systems also support reuse by
                   allowing the logic of a solution to be created once and re-evaluated with a new set of input
                   values. While parametric systems allow analysts and designers to explore the designs and
                   visualizations created by different parameter values, a parametric system only represents one design.
                   To create alternative solutions, problem solvers resort to workarounds like storing alternative
                   designs on layers, or by saving versions of their work to disk. It is difficult for problem solvers
                   to compare or combine parts of solutions as most applications can have only one state and thus only
                   one solution. To allow problem-solvers to represent alternative solutions in a single parametric
                   graph, we have begun work on a subjunctive parametric system. A subjunctive parametric system is a
                   parametric system that allows variations in parameter values and logic to be represented in a single
                   parametric graph. To realize these ideas, we have prototyped a programming language called
                   Shiro. Shiro allows problems solvers to describe nodes, subjunctive nodes, graphs, and states. States
                   describe alternative solutions as they indicate the active subjuncts for the subjunctive nodes in a
                   graph. Shiro is the first step to make alternatives first class objects of a solution as it allows
                   problem solvers to computationally represent alternative parametric solutions. }

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