redo

Undoes and the redoes (re-applies) an expression identified by a tag.

              pdef = Ruote.process_definition do
                sequence :tag => 'kilroy' do
                  alpha
                  _redo :ref => 'kilroy', :unless => '${f:ok} == true'
                end
              end

will redo at tag ‘kilroy’ if the field ‘ok’ is not set to true.

(redo is escaped as _redo not to conflict with the “redo” Ruby keyword)

Maybe this case is better served by a cursor/rewind combination

              pdef = Ruote.process_definition do
                cursor do
                  alpha
                  rewind :unless => '${f:ok} == true'
                end
              end

(There is a big difference though, a redo will restart with the workitem
as it was when the workitem entered the tagged region, while the rewind
keeps the workitem as is)