The following are the main points you should have learned from this chapter:

• •

  Individual–property–value triples form a flexible, universal representation for relations.

• •

  Ontologies allow for semantic interoperability and knowledge sharing.

• •

  OWL ontologies are built from individuals, classes, and properties. A class is a set of real and potential individuals.

• •

  A meta-interpreter can be used to build a lightweight implementation of a knowledge-based system that can be customized to fit the requirements of the representation language.