The VIEWAS system makes a view of a concrete type as a data structure type, such as a linked-list or avl-tree.

• VIEWAS makes correspondences between abstract and concrete records
  • Pointers

  • Values, e.g. field to sort on

  • Choices, e.g. sort-direction

  • Groups of fields, e.g. contents is everything except the link pointer.

• Type filtering and propagation of choices reduce input from user; simple views can be made automatically.

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