Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In Computer Science, an ABox is an "assertion component"—a fact associated with a terminological vocabulary within a knowledge base. The terms ABox and TBox are used to describe two different types of statements in ontologies. TBox statements describe a system in terms of controlled vocabularies, for example, a set of classes and properties. ABox are TBox-compliant statements about that vocabulary. TBox statements are sometimes associated with object-oriented classes and ABox statements associated with instances of those classes.

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