#gable_roof__gableroof__saddle_roof__saddleback__saddleback_roof  a double sloping roof with a ridge and gables at each end
  supertype:  #roof  a protective covering that covers or forms the top of a building
  subtype:  #gambrel_roof  a gable roof with two slopes on each side and the lower slope being steeper
  part:  #gutter__trough  a channel along the eaves or on the roof; collects and carries away rainwater
  part:  #ridgepole__ridge__rooftree  a beam laid along the ridge of a roof; provides attachment for upper end of rafters

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