(subclass PetroleumProduct Oil) | Mid-level-ontology.kif 1677-1677 | PetroleumProduct est une sous-classe de Oil |
(subclass FossilFuel PetroleumProduct) | Mid-level-ontology.kif 1688-1688 | FossilFuel est une sous-classe de PetroleumProduct |
(subclass Petroleum PetroleumProduct) | Economy.kif 5684-5684 | Petroleum est une sous-classe de PetroleumProduct |
(subclass RefinedPetroleumProduct PetroleumProduct) | Economy.kif 5929-5929 | RefinedPetroleumProduct est une sous-classe de PetroleumProduct |