#oxyacid__oxygen_acid  any acid that contains oxygen
  supertype:  acid  any of various water-soluble compounds having a sour taste and capable of turning litmus red and reacting with a base to form a salt
  subtype:  hypophosphoric_acid  a crystalline tetrabasic acid (H4P2O6)
  subtype:  hypophosphorous_acid__hypophosphorousacid__phosphorous_acid__phosphorousacid__orthophosphorous_acid  a clear or yellow-colored monobasic acid (H3PO2)
  subtype:  polyphosphoric_acid  a series of oxyacids of phosphorus
     subtype:  metaphosphoric_acid  a glassy solid acid ([HPO3]n) often used as a dehydrating agent
     subtype:  pyrophosphoric_acid  a solid acid formed by reactions of orthophosphoric acid
  subtype:  periodic_acid__periodicacid  any oxygen-containing acid of iodine
  subtype:  phosphoric_acid__orthophosphoric_acid__orthophosphoricacid  an acid used in fertilizers and soaps: H3PO4
  subtype:  tungstic_acid  an oxyacid of tungsten (often polymeric in nature) formed by neutralizing alkaline tungstate solutions
  subtype:  vanadium_pentoxide__vanadic_acid__vanadicacid  any of various oxyacids of vanadium; known mostly in the form of its salts

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