#gate  a door-like movable barrier in a fence or wall
  supertype:  movable_barrier__movablebarrier  a barrier that can be moved to allow passage
  instance:  Dipylon_gate
  part:  flexible_joint  lock.holdfast
  subtype:  head_gate  a gate upstream from a lock or canal that is used to control the flow of water at the upper end
  subtype:  lock-gate  a gate that can be locked
  subtype:  lychgate__lichgate  a roofed gate to a churchyard, formerly used as a temporary shelter for the bier during funerals
  subtype:  portcullis  gate consisting of an iron or wooden grating that hangs in the entry to a castle or fortified town; can be lowered to prevent passage
  subtype:  postern  a small gate in the rear of a fort or castle
  subtype:  tailgate__tailboard  a gate at the rear of a vehicle; can be lowered for loading
  subtype:  tail_gate  a gate downstream from a lock or canal that is used to control the flow of water at the lower end
  subtype:  tollgate__tollbar  a gate or bar across a toll bridge or toll road which is lifted when the toll is paid
  subtype:  turnpike  (from 16th to 19th centuries) gates set across a road to prevent passage until a toll had been paid
  subtype:  turnstile  a gate consisting of a post that acts as a pivot for rotating arms; set in a passageway for controlling the persons entering
  subtype:  wicket_door__wicket__wicket_gate  small gate or door (especially one that is part of a larger door)

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