map.namespace :xxx => no xxx_url() available?

Hi all!

I have the following URL structure:

/informations # Just a normal controller without any scaffolding
functionality
/informations/encyclopedia # Another normal controller
/informations/news # A scaffold controller which scaffolds the News
model

My routes look like this:

map.namespace :informations do |informations|
  informations.encyclopedia 'encyclopedia/:action', :controller =>
'encyclopedia'
  informations.resources :news
end

I would expect now to be able to use the following URL path helpers:

informations_url # Does not work!
informations_encyclopedia_url # Does not work!
informations_news_path # Does work!

Why do the 1st two not work?

Thanks
Josh