Hierarchy - Revision history

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			[[Category: Basics]]

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	The term 'hierarchy' is also used in information systems [[architecture]], where it is used to refer the the relationships between the sub-systems in a system.		The term 'hierarchy' is also used in information systems [[architecture]], where it is used to refer the the relationships between the sub-systems in a system.

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'''Hierarchy''' is a term used in several contexts when dealing with computers. The general meaning is a 'tree', i.e. a data structure with a single 'root' node, from which descends (or ascends, depending on how it is represented) a branching set of nodes. A node (other than the root) has only one parent, but may have more than one child.

Most [[file system]]s are now hierarchies, an approach started by [[Multics]]. The [[Domain Name System]] of the [[Internet]] is also structured as a hierarchy, with nodes 'com', 'edu', 'gov' etc all childred of the root.

The term 'hierarchy' is also used in information systems [[architecture]], where it is used to refer the the relationships between the sub-systems in a system.

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