Wikipedia:Tip of the day/May 8, 2008

Transclusion

Including the contents of a template page on a different page (by surrounding the page name with double braces, ie. " – ") and leaving out the "Template:" prefix) is called transclusion. This allows the other page to be automatically updated whenever the template page is updated. In addition, pages in the following namespaces can be transcluded: Category:, Help:, Portal:, User:, and Wikipedia:. The only difference is that you must include the prefix (followed by a colon) with the page's name inside the double braces.  Images also can be transcluded, but this is done using double square brackets instead of braces.  Here are some examples:

Pic of the day • •

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