This paper introduces multitrees, a new type of structure for representing information.Multitrees are a class of directed acyclic graphs (DAGs) with the unusual property that they have large easily identifiable substructures that are trees.These subtrees have a natural semantic interpretation providing alternate hierarchical contexts for information, as well as providing a natural model for hierarchical reuse.The numerous trees found within multitrees also afford familiar, tree-based graphical interactions.
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Furnas et al. (1994) studied this question.
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