Authentication: multiple challenges?

[Rhett Sutphin]

Hi,

According to RFC2616 section 14.47, it should be possible to have  
multiple challenges in a WWW-Authenticate header.  I can't see a way  
to achieve that with Restlet.  Is there a way?

Context:  I'm trying to protect a collection of resources with both  
HTTP Basic and a custom token-based authentication scheme.  If it's  
not possible to have multiple challenges, I'll just challenge with  
Basic and then accept either form.

Thanks,
Rhett