Problem with mod_proxy special character(s)

I need to proxy from /?xml to http://localhost:5282/?xml. So, I set the
proxy settings as follows: 

        ProxyPass /?xml http://localhost:5282/?xml 
        ProxyPassReverse /xml http://localhost:5282/?xml 

However, apparently mod_proxy converts the character '?' to '%3f' and so the
proxy does not match when I try to access "/?xml". It matches only if I try
to use "/%3fxml" but then when it proxies, it tries to get to
"http://localhost:5282/%3fxml" and so does not find the destination.

Is there a way to turn off the conversion of '?' to '%3f' ? 

Thanks for your help. 

-Sanjeev