[Mediawiki-l] If else statement

[Ekompute .info]

Hi, I am trying to have 2 sitenotices, one for the main namespace and one
for ALL the rest. I tried:

{{#if: {{ns:0}} |
xxxxxxxxxxxx
xxxxxxxxxxxx
}}

{{#if: !{{ns:0}} |
xxxxxxxxxxxx
xxxxxxxxxxxx
}}

but it is not working. Your assistance is deeply appreciated.

PM Poon