yes
 | This template is used in system messages, and on approximately 2,510,000 pages, or roughly 4% of all pages. Changes to it can cause immediate changes to the Wikipedia user interface. To avoid major disruption and server load, any changes should be tested in the template's /sandbox or /testcases subpages, or in your own user subpage. The tested changes can be added to this page in a single edit. Please discuss changes on the talk page before implementing them. |
 | This template uses Lua: |
Detects whether the current or the given namespace has subpages enabled. Returns "yes" if it does, and an empty string otherwise.
This template can be substituted.
Usage
((ns has subpages))→ yes((ns has subpages|Template))→ yes((ns has subpages|Category))→ yes((ns has subpages|))(main space) →((ns has subpages|((ns:0))))(main space) →((ns has subpages|:))(main space) →((ns has subpages|((ns:Talk))))→ yes((ns has subpages|Category talk))→ yes((ns has subpages|File:Foo))→((ns has subpages|Foo))→((ns has subpages|:Template))→ yes
See also
((namespace detect))