'structure' => {
                 'groups' => {
                               'properties' => {
                                                 'groupid' => undef,
                                                 'grouptitle' => undef
                                               },
                               'source' => 'user.groups'
                             },
                 'identity' => {
                                 'properties' => {
                                                    'username' => undef,
                                                    'id' => undef
                                                  },
                                 'source' => undef
                               }
              },