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)abbrev category DSTRCAT DesingTreeCategory
++ Authors: Gaetan Hache
++ Date Created: jan 1998
++ Date Last Updated: May 2010 by Tim Daly
++ Description: 
++ This category is part of the PAFF package

DesingTreeCategory(S) : Category == SIG where
  S : SetCategory

  SIG ==> RecursiveAggregate(S) with

    shallowlyMutable
  
    finiteAggregate
       
    tree : (S,List %) -> %
      ++ tree(nd,ls) creates a tree with value nd, and children ls.
  
    tree : S -> %
      ++ tree(nd) creates a tree with value nd, and no children
  
    tree : List(S) -> %
      ++ tree(l) creates a chain tree from the list l