| Annotation Type | Description | 
|---|---|
| PropertyKey | 
 Indicates that the  
String type can be used as key in a property file or resource bundle. | 
| PropertyKeyBottom | 
 The bottom type in the PropertyKeyChecker (and associated checkers) qualifier hierarchy. 
 | 
| UnknownPropertyKey | 
 Indicates that the  
String type has an unknown property key property. |