How to register scheme in restlet engine?

[Cobse]

I am using Restlet Version 2.0 Milestone 5 (testing).

When i try to create ChallengeResponse and set in ClientResource i get the
below warning:

org.restlet.engine.security.AuthenticatorUtils format
WARNING: Challenge scheme SID6 not supported by the Restlet engine.
 
Below is the code:

        Context context = new Context();
        context.getParameters().add(ADAPTER_PARAM, ADAPTER_VALUE);

        ClientResource clientResource = new ClientResource(context,
clientUrl);

        ClientInfo clientInfo = new ClientInfo();
        clientInfo.getAcceptedMediaTypes()
                .add(new Preference<MediaType>(MEDIA_UDS));
        clientResource.setClientInfo(clientInfo);

        Form requestHeaders = new Form();
        requestHeaders.add(HEADER_CORRELATION_ID, _responseId);
        requestHeaders.add(HEADER_DATE, DateUtils.format(new Date()));

        clientResource.getRequestAttributes().put(ATTRIBUTE_HEADERS,
                requestHeaders);


           ChallengeResponse challengeResponse = new
ChallengeResponse(ChallengeScheme,
                "5J17HSDFSFWRWER:WERSDSDSFSDF//dssdfsz");
        clientResource.setChallengeResponse(challengeResponse);

        ChallengeAuthenticator authenticator =
                new ChallengeAuthenticator(context, ChallengeScheme,
"realm");

Now if i comment the ChallengeResponse code and add the scheme in Form
directly it works fine. But doing this is a hack. I want to know how i can
register my own scheme.

below is the code for setting in Form .

        // This is a hack and should be done with ChallengeResponse
        /*
        Form.add("Authorization",
                "SID6 5J17HSDFSFWRWER:WERSDSDSFSDF//dssdfsz");
        */

Appreciate prompt response.

Thanks,
Cobse

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