#high_tide__high_water__highwater  the tide when the water is highest
  exclusion:  #low_tide
  supertype:  #tide  the periodic rise and fall of the sea level under the gravitational pull of the moon
  subtype:  #direct_tide  the occurrence of high tide on one side of the earth coinciding with high tide on the opposite side
  subtype:  #neap_tide__neap  a less than average tide occurring at the first and third quarters of the moon
  subtype:  #springtide  a greater than average tide occurring during the new and full moons

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