• COUNT_TRUTH_VALUE : opencog
• DEFAULT : opencog
• FUZZY_TRUTH_VALUE : opencog
• INDEFINITE_TRUTH_VALUE : opencog
• NULL_TRUTH_VALUE : opencog
• NUMBER_OF_TRUTH_VALUE_TYPES : opencog
• PROBABILISTIC_TRUTH_VALUE : opencog
• SIMPLE_TRUTH_VALUE : opencog
• STI_BASED : opencog
• TV_FITNESS_BASED : opencog
• USE_NEWER_TV_TYPE : opencog
• USE_OLDER_TV_TYPE : opencog
• USE_STRONGER_TV_TYPE : opencog
• USE_WEAKER_TV_TYPE : opencog