• Clib: Porter, Ken Barker, et al.: uses KM.
• Cyc KB: 47,000 concepts, 306,000 relations.
• SUMO: Suggested Upper Merged Ontology, mapped to WordNet.

  
      *   Entity
            o Physical
                  + Object
                        # SelfConnectedObject
                              * Substance
                              * CorpuscularObject
                              * Food
                        # Region
                        # Collection
                        # Agent 
                  + Process 
            o Abstract
                  + SetOrClass
                  + Relation
                  + Quantity
                        # Number
                        # PhysicalQuantity 
                  + Attribute
                  + Proposition
  

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