Editing Template:Documentation/doc (section)

===Subject namespaces vs. talk namespaces===
Terminology: ''Subject namespaces'' are the opposite of ''talk namespaces''. For instance "Template:" is the subject space of "Template talk:".

This template is usually placed in a subject namespace, within {{tag|noinclude|o}} tags. But in some cases this template needs to be on the talk page:

* In the Mediawiki namespace, since {{tag|noinclude|o}} often does not work in system messages, and since the Mediawiki namespace needs to be kept clean for performance reasons.

When placed on talk pages, this template usually is placed near the top of the page and without {{tag|noinclude}} tags.

The /doc, /sandbox and /testcases pages should normally be in the subject namespace, except in the namespaces that do not have the MediaWiki [[meta:Help:Link#Subpage feature|subpage feature]] enabled: Main, File, Mediawiki and Category. (But currently we only show the /sandbox and /testcases links from User, User talk, Template and Template talk namespaces.) There are also a whole bunch of other technical reasons why the /doc page must be stored under the talk page for those (but only those) namespaces.

This template automatically points its [create] links for the /doc, /sandbox and /testcases to the right namespace.