[Zope] How to list the attributes of an object?

Is this possible? I'm trying to display all the roles that a script has: I get my list of roles, but I don't know what attributes they have. I also can't find "Role" as a class listed in an API anywhere. I got this far: <dtml-in "AUTHENTICATED_USER.getRoles()"> <dtml-var "_"> </dtml-in> ...but that just prints an object tag. Thanks, Robb