Rails friendly url routing with open id

http://mysite.com/identity/:html_encoded_openid
or
http://mysite.com/identity/:html_encoded_openid.xml

my-friendly-openid-com
or
23-my-friendly-openid-com

map.connect 'identity/:id', :controller => "identity",
                            :action => "foo",
                            :requirements => {:id => /(w+.?)+/}