Editing Permalink (section)

==Permalinks and versions==
[[Image:Wikipedia permalink example.png|thumb|right|200px|On Wikipedia, a permanent link to a specific version of an article is obtained from the "Permanent link" entry in the toolbox.]]
Many blogging and content management systems do not support [[revision control|versioning]] of content, that is, if an entry is updated, a uniquely accessible version is not created.  Thus, in the context of these systems, a permalink may refer to different content over time.  In the context of systems that support versioning, such as most [[wiki]]s, a permalink is commonly understood as a link to a ''specific version''. Here, both the link itself and the resource it refers to should not change over time.

[[MediaWiki]], the software that runs [[Wikipedia]], supports this type of permanent link.  In its current implementation, old versions of specific articles, images, and templates are referenceable by unique unchanging URLs, though current entries may not use old versions of images and templates.  Permanent links to specific versions are recommended for citing articles from sources such as Wikipedia and [[Wikinews]], to ensure that the content remains unchanged for review. A reviewer can then view the cited revision, the current revision, and the differences between the two.