AnnotationReference (Annot8 API 0.4.0 API)

```
public interface AnnotationReference
```
A reference to an annotation.
As annotations can change (though their id and content stays the same) we can't simply hold Annotation in Java objects. Instead we hold a reference to them (based on content and annotation ids).
Since an content or annotation may be deleted, we do not know if the annotation still exists when we call toAnnotation.

Method Summary

All Methods Static Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`String`	`getAnnotationId()`	The annotation's id
`String`	`getContentId()`	The id of the content to which this annotation belongs.
`Optional<Annotation>`	`toAnnotation()`	Convert the reference to an annotations.
`static Stream<Annotation>`	`toAnnotations(Stream<AnnotationReference> references)`	Convert a stream of annotation references to annotations

- Method Detail
  - toAnnotations
```
static Stream<Annotation> toAnnotations(Stream<AnnotationReference> references)
```
    Convert a stream of annotation references to annotations
    
    Parameters:
    
    references - reference to convert (may be null)
    
    Returns:
    
    annotations
  - getContentId
```
String getContentId()
```
    The id of the content to which this annotation belongs.
    
    Returns:
    
    the content id
  - getAnnotationId
```
String getAnnotationId()
```
    The annotation's id
    
    Returns:
    
    the id
  - toAnnotation
```
Optional<Annotation> toAnnotation()
```
    Convert the reference to an annotations.
    Since the underlying content or annotation may have been deleted this returns an optional.
    
    Returns:
    
    the annotation