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In an operating system, an example of namespace is a directory. Each name in a directory uniquely identifies one file or subdirectory. [9] As a rule, names in a namespace cannot have more than one meaning; that is, different meanings cannot share the same name in the same namespace.
Names are considered equal if the namespace URI and local name match. In addition, most models provide some way of determining which namespaces have been declared for a given element. This information is needed because some XML vocabularies allow qualified names (containing namespace prefixes) to appear in the content of elements or attributes ...
The namespace name is a useful variable for searching in and reporting on sets of pages. It is also used to apply features that configure the sets of pages in one namespace differently from another namespace. Using the namespace name MediaWiki can: Search for pages in a particular namespace only. Report on content or changes in content of a ...
The feature works by having the same namespace for a set of resources and processes, but those namespaces refer to distinct resources. Resources may exist in multiple namespaces. Examples of such resources are process IDs, host-names, user IDs, file names, some names associated with network access, and Inter-process communication.
Originally, the namespace name could match the syntax of any non-empty URI reference, but the use of relative URI references was deprecated by the W3C. [31] A separate W3C specification for namespaces in XML 1.1 permits Internationalized Resource Identifier (IRI) references to serve as the basis for namespace names in addition to URI references ...
With namespaces, no capitalization of a namespace name, apart from the first letter, is allowed. Also, no spaces (which are translated to underscores) are allowed before or after the colon of a namespace name. For example, the following are not allowed: HELP:, HeLp:, Help_: or Help:_ (with spaces rather than underscores).
The term collision domain may also be used to refer to a system in which a single name or identifier is open to multiple interpretations by different layers or processing. The notion of a namespace has been widely adopted as a software programming practice to avert undesired clashes. Note that its use in the networking field is superficially ...
The project namespace or Wikipedia namespace is a namespace consisting of administration pages with information or discussion about Wikipedia. Pages in this namespace will always have the prefix Wikipedia:. They can also be reached by alias WP: or the standard (for any MediaWiki site) prefix Project:. Its namespace number is four (4).