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The core O/RM functionality as provided by Hibernate

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/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
 * See the lgpl.txt file in the root directory or .
 */
package org.hibernate.query.criteria.internal.predicate;


/**
 * Models what ANSI-SQL terms a truth value.  Specifically, ANSI-SQL defines TRUE, FALSE and
 * UNKNOWN as truth values.  These truth values are used to explicitly check the result of a
 * boolean expression (the syntax is like a > b IS TRUE.  IS TRUE is the assumed default.
 * 
 * JPA defines support for only IS TRUE and IS FALSE, not IS UNKNOWN (a > NULL
 * is an example where the result would be UNKNOWN).  All 3 are provided here for completness.
 *
 * @author Steve Ebersole
 */
public enum TruthValue {
	TRUE,
	FALSE,
	UNKNOWN
}