# File lib/ruote/part/participant_list.rb, line 162
    def lookup (participant_name, workitem, opts={})

      pinfo = participant_name

      if participant_name.is_a?(String) && participant_name[0, 5] != 'inpa_'
        pinfo = lookup_info(participant_name, workitem)
      end

      pinfo ? instantiate(pinfo, opts) : nil
    end