| (subclass Pipeline Transitway) | Transportation.kif 773-773 | Pipeline is a subclass of transitway |
| (subclass SewageSystem Pipeline) | Transportation.kif 785-785 | Sewage system is a subclass of pipeline |
| (subclass CrudeOilPipeline Pipeline) | Transportation.kif 797-797 | Crude oil pipeline is a subclass of pipeline |
| (subclass NaturalGasPipeline Pipeline) | Transportation.kif 809-809 | Natural gas pipeline is a subclass of pipeline |
| (subclass PetroleumProductPipeline Pipeline) | Transportation.kif 821-821 | Petroleum product pipeline is a subclass of pipeline |
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