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An XML namespace is declared using the reserved XML attribute xmlns or xmlns:prefix, the value of which must be a valid namespace name.. For example, the following declaration maps the "xhtml:" prefix to the XHTML namespace:
In computing, a namespace is a set of signs (names) that are used to identify and refer to objects of various kinds. A namespace ensures that all of a given set of objects have unique names so that they can be easily identified. Namespaces are commonly structured as hierarchies to allow reuse of names in different contexts.
A Wikipedia namespace is a set of Wikipedia pages whose names begin with a particular reserved word recognized by the MediaWiki software (followed by a colon). For example, in the user namespace all titles begin with the prefix User:.
A QName concisely associates the URI of an XML namespace with the local name of an element, attribute, or identifier in that namespace. [1] To make this association, the QName assigns the local name a prefix that corresponds to its namespace. In all, the QName comprises the URI of the XML namespace, the prefix, and the local name.
Prefix is the most widely used and powerful filter as it can mimic the namespace filter, and because intitle: cannot easily target a single page, even together with other filters. Special:PrefixIndex is a MediaWiki, graphical, version, using only prefix: to find pages.
A pagename cannot consist of only a namespace prefix. A pagename cannot begin or end with a space (which would be translated to an underscore in the URL). A pagename cannot contain % followed by 2 hexadecimal digits (a pagename can have the character % , but it must be percent-encoded as %25 in the URL, to prevent it from being interpreted as a ...
Only encyclopedia articles are created without a namespace prefix. All pages outside of the article mainspace are prefixed by the namespace followed by a colon before the title, e.g., your user page's title starts with the prefix User: The various namespaces are shown in the table to the right.
The Wikipedia namespace prefix can also be further abbreviated as WP:. These shortcut pages are just redirects to the target page. For example, Wikipedia:Neutral point of view can be written as WP:NPOV to link to it, or typed into the search bar. Shortcuts to a page are usually listed in a box in the top right of that page.