Manual:Namespace/ca

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Technical overview
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The "main namespace" does not have a prefix. Also, pages in the main namespace cannot have names starting with any of the existing namespaces prefixes followed by a colon.

Pages can be moved between namespaces simply by changing the prefix part of their title.

Each namespace has a corresponding namespace index. Within the database, the title is split into namespace index and text title, and this is used for storage in the  and   columns, among others.

Subject and talk namespaces

 * See Help:Talk pages for instructions on how to use talk pages.

Most namespaces have an associated discussion namespace (or "talk" namespace). All discussion namespaces have odd-integer indices, and the discussion namespace index for a specific namespace with index n is n+1. The namespaces with even-integer indices are subject namespaces (note that this is a distinct concept from content namespaces). The subject-talk duality can be explored using the  and   magic words. The  tag of pages in talk namespaces has the " " CSS class, which might be useful for styling.

Built-in namespaces
MediaWiki ships with 18 built-in namespaces:
 * 16 "real" namespaces, corresponding to actual pages, numbered 0 to 15, and grouped in subject/talk pairs
 * 2 "virtual" namespaces (one for dynamically generated special pages, and one serving as an alias for direct file links), numbered -1 and -2, respectively. Since these namespaces don't correspond to pages stored in the database, one cannot create or delete pages in these namespaces, and there are no corresponding discussion namespaces.

The full list is presented in the table below.

Each namespace also has a constant derived from its name, with all letters in uppercase, spaces replaced by underscores, and prefixed by "NS_". For example, the constant for the "User talk" namespace is NS_USER_TALK. A complete list can be found in Manual:Namespace constants.

in MediaWiki 1.13 and above.

All pages in discussion namespaces have a "post a comment" feature (see Help:Section#Adding a section at the end on Meta).