| ISA | SCALAR-EVENT-ATTRIBUTE |
| SUBCLASSES | FREQUENCY-RATE RECOVERY-RATE |
| DESCENDANTS | FREQUENCY-RATE RECOVERY-RATE |
| ANCESTORS | ALL ATTRIBUTE PROPERTY SCALAR-ATTRIBUTE SCALAR-EVENT-ATTRIBUTE |
| RELATIONS | DOMAIN : DISEASE-EVENT |
| INHERITED ATTRIBUTES | RANGE : <=0>=1 (from SCALAR-ATTRIBUTE) |