# File lib/ruote/fei.rb, line 181
    def self.direct_child?(parent_fei, other_fei)

      %w[ wfid engine_id ].each do |k|
        return false if parent_fei[k] != other_fei[k]
      end

      pei = other_fei['expid'].split(CHILD_SEP)[0..-2].join(CHILD_SEP)

      (pei == parent_fei['expid'])
    end