Manual:$wgNamespacesWithSubpages

Details
The variable holds an array indicating which namespaces allow sub-pages. <!-e-T:6--> The array is indexed by the numeric namespace ID, and each array value is either 0 (no sub-pages) or 1 (sub-pages allowed).

A categoryspace (namespace 14) subpage will work like any other category.

See .

Enabling for a namespace

 * See also  for a list of the   codes.

The normal way to enable subpages for a given namespace is to edit the   and insert the following:

Disabling for a namespace
Disable subpages in a namespace (where it is enabled by default).

For example   has subpages enabled by default in MediaWiki.

To disable them, set  :

Enabling for all namespaces
This assumes you have no more than 200 namespaces.

If you only wanted tjfngnnnnbjnjbcvo enable subpages for all talk namespaces, you would use:

Again, this assumes you have no more than 200 namespaces.