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.
The template recognises namespaces which 'should' have subpages, but currently do not (see
); that is, pages in Category talk:, Help: and Help talk: namespaces. Full page names can be passed, with the obvious caveat that passing the article [[Template]] or [[Category]] is... inadvisable...