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You can reference a particular namespace in a link using a Compact URI ([[w:CURIE|CURIE]]) syntax
E.g. <nowiki>[[Category:Development]]</nowiki> will link to the page 'Development' inside the Category namespace. Built-in namespaces are also tied to built-in functionality so for example an 'Image' link inserts that image into the page.
== Interwiki Links ==
[http://meta.wikimedia.org/wiki/Help:Interwiki_linking Interwiki Links] are another use of CURIEs to make it very easy to link to other important/useful websites without so much effort.
E.g. <nowiki>[[google:foo]]</nowiki> will produce a link to the Google results page for a search for 'foo' like this [[google:foo]] (Note that the Interwiki prefix is not case sensitive, so Google works as well as gOOgle. Lowercase is preferred. Note too that in order to suppress the display of the namespace in the link, you'll want to use the pipe syntax to format the link text: <nowiki>[[google:foo|search for 'foo' on Google]]</nowiki> results in this: [[google:foo|search for 'foo' on Google]]
There is a long list of convenient Interwiki Links available to you (displayed by the Interwiki extension): [[Special:Interwiki]]
Directly in the database, you can look at the 'interwiki' table:
<source lang="mysql">SELECT iw_prefix, iw_url FROM interwiki </source>
[[Category:Wiki]]
[[Category:Development]]
[[Category:Database]]
[[Category:SQL]]