| ClassificationFilter | Filters on the classification column, offering the classifications that exist. |
| EnumFilter | Filters on a stored enum value, offering only the values that exist. |
| RealmFilter | Filters on the realm column, offering the realms that exist. |
| SeverityFilter | Filters on the severity column, offering the severities that exist. |
| VerbFilter | Filters on the verb column, offering the verbs that exist. |