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It is named a "tree structure" because the graph looks a bit like a Tree , even though the tree is generally shown upside down compared with a real tree; that is to say with the root at the top and the leaves at the bottom. In Graph Theory , a Tree is a connected Acyclic Graph (or sometimes, a connected Directed Acyclic Graph in which every vertex has Indegree 0 or 1). An acyclic graph which is not necessarily connected is sometimes called a Forest (because it is a set of trees). Every tree structure has a member that has no Superior . This member is called the "root" or Root Node . The converse is not true: infinite tree structures need not have a root node. ''Illustration: A tree structure showing the possible hierarchical organization of an encyclopedia. This specific example happens to be a Complete Binary Tree , which means all nodes have exactly zero or two child nodes.'' The lines connecting elements are called "branches," the elements themselves are called " Node s." Nodes without children are called "end-nodes" or "leaves." The names of relationships between nodes are modeled after family relations. In computer science, traditionally only names for male family members had been used. In linguistics, the names of female family members are used. It is said that this was an express countermovement to the traditional naming convention, started by the female students of linguist Noam Chomsky . However, nowadays, in computer science at least, the gender-neutral names "parent" and "child" have largely displaced the older "father" and "son" terminology. The starting node is often called the "root."
In the example, "encyclopedia" is the parent of "science" and "culture," its children. "Art" and "craft" are siblings, and children of "culture." actually used a tree diagram to show which way its subjects were ordered, though not a binary tree.]] Tree structures are used to depict all kinds of Taxonomic knowledge, such as family trees, the Evolutionary Tree , the grammatical structure of a language (the famous example being S -> NP VP, meaning a sentence is a noun phrase and a verb phrase), the way web pages are logically ordered in a web site, et cetera. Trees have a number of interesting properties:
Tree structures are used extensively in Computer Science and Telecommunications . EXAMPLES OF TREE STRUCTURES
REPRESENTING TREES There are many ways of visually representing tree structures. Almost always, these boil down to variations, or combinations, of a few basic styles:
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