Trees, Clones and Views
Leo is an outliner. Leo's outline pane shows a tree (data structure) of data nodes. Nodes contain headlines, body text, and other information. Headlines naturally serve as descriptions of the body text. For example, @file nodes are nodes whose headline starts with @file. Leo trees are in fact directed acyclic graphs; nodes may have more than one parent. Leo calls such nodes clones. Clones appear in several places in the outline pane. Views are simply nodes whose children contain clones. A single outline may contain arbitrarily many views of the nodes contained therein.
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“It is even more grim and wild than you had anticipated, a damp and intricate wilderness, in the spring everywhere wet and miry. The aspect of the country, indeed, is universally stern and savage, excepting the distant views of the forest from hills, and the lake prospects, which are mild and civilizing in a degree.”
—Henry David Thoreau (18171862)