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A globally unique identifier (GUID) or universally unique identifier (UUID) is a 128-bit number that permanently identifies a data object in the KB.

  • Global means that the GUID is the same across all Cyc instances.
  • Unique means that the GUID refers to exactly one data object.
  • Permanent means that the GUID never changes.

For example, bd5880f4-9c29-11b1-9dad-c379636f7270 is the GUID for #$Thing.