[Mediawiki-l] Howto Create a new namespace

[TEXTORIS Julien]

Hi,

Is it possible to create new namespaces for our own mediawiki project ?

I tried to add to the list of Namespace.php, Language.php and 
Languagefr.php my new ns, but it appears like (article) in 
Special:Allpages, and if i tried to create a new article 
MyNewNS:something, it brings me to the main ns -> something.

What else modifications do i have to do ?

Thanks for help

Julien