| interface  | ContentType | Meta annotation, specifies that an annotation represents a content type, such
 as a time span or a frequency. | 
| interface  | DataAmount | Event field annotation, specifies that a value represents an amount of data (for example, bytes). | 
| interface  | Experimental | Annotation that specifies that an element is experimental and may change
 without notice. | 
| interface  | Frequency | Event field annotation, specifies that the value is a frequency, measured in Hz. | 
| interface  | MemoryAddress | Event field annotation, specifies that the value is a memory address. | 
| interface  | Percentage | Event field annotation to use on fractions, typically between 0.0and1.0, to specify that the value is a percentage. | 
| interface  | Timespan | Event field annotation, specifies that the value is a duration. | 
| interface  | Timestamp | Event field annotation, specifies that the value is a point in time. | 
| interface  | Unsigned | Event field annotation, specifies that the value is of an unsigned data type. |