[Ur] Type signature for a form handler

[Burton Samograd]

Hi again,

I'm can't figure out what the type signature should be for a form handler
in a submit button (Auth.login below) so I can put it in my auth.urs file:

         <xml>
           <form>
                Username:<textbox{#Username}/>
                Password:<password{#Password}/>
                <submit value="Login" action={Auth.login}/>
           </form>
         </xml>

Any help on what I should use for a signature appreciated.

Burton
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