#pool  an excavation that is (usually) filled with water
  supertype:  #hole_in_the_ground__excavation  a hole in the ground made by excavating
  subtype:  #cistern  an artificial reservoir for storing liquids; especially an underground tank for storing rainwater
     subtype:  #cesspool__cesspit__sump  a covered cistern; waste water and sewage flow into it
     subtype:  #rain_barrel  a barrel used as a cistern to hold rainwater
  subtype:  #swimming_pool__swimming_bath__natatorium  pool that provides a facility for swimming: "`swimming bath' is a British term"
     subtype:  pm#heated_swimming_pool
     subtype:  pm#outdoor_swimming_pool
  subtype:  #wading_pool  a shallow pool for children
  subtype:  #water_jump__waterjump  a pool or stream in a steeplechase or similar contest
  subtype:  pm#spa
     subtype:  pm#in_room_spa

3 statements are about indirect instances of #pool: wotif#graph1_on_http://www.wotif.com/Accommodation/viewdeal.asp?PropID=2667, wotif#graph1_on_http://www.wotif.com/Accommodation/viewdeal.asp?PropID=4384, wotif#graph1_on_http://www.wotif.com/Accommodation/viewdeal.asp?PropID=5241
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