Help needed in Routes

Hi All

I am now using Rails 2.3.4
i would want to have a route like

In Rails 2.1.2, i had used the format
map.namespace :mysite do |mysite|

mysite.show_question '/questions/show.:format/:title', :controller

=> ‘mysite_questions’, :action => ‘show’


But now the same route shows up an error in Rails 2.3.4.I am not able to
start the application even.
Kindly tell me what should be followed so that the application runs.

Thanks In Advance,