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Concept
Outliner
Summary
An outliner (or outline processor) is a specialized type of text editor (word processor) used to create and edit outlines, which are s which have a tree structure, for organization. Textual information is contained in discrete sections called "nodes", which are arranged according to their topic–subtopic (parent–child) relationships, like the members of a family tree. When loaded into an outliner, an outline may be collapsed or expanded to display as few or as many levels as desired.
Outliners are used for storing and retrieving textual information, with terms, phrases, sentences, or paragraphs attached to a tree. So rather than being arranged by document, information is arranged by topic or content. An outline in an outliner may contain as many topics as desired. This eliminates the need to have separate documents, as outlines easily include other outlines just by adding to the tree.
The main difference between a hand-written outline and a digital one is that the former is usually limited to a summary or blueprint of a planned document, while the latter may easily include all of the content of the entire document and many more. In other words, as a hand-written work an outline is a writing tool, but on a computer, it is a general purpose format supported by a robust development and display medium capable of handling knowledge from its creation to its end usage.
Outliners may be used in content creation instead of general word processors for capturing, organizing, editing, and displaying knowledge or general textual information. Outliners are ideal for managing lists, organizing facts and ideas, and for writing computer programs. They are also used for goal and task management (including personal information management and project management), and for writing books and movie scripts.
An alternative to outliners are mind mappers, which display a tree structure as a node–link diagram.
The principal attribute of outline editors is that they support or enforce the use of a hierarchy of their items.
Official source
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