See: Description
| Class | Description | 
|---|---|
| PDAnnotation | This class represents a PDF annotation. | 
| PDAnnotationFileAttachment | This is the class that represents a file attachement. | 
| PDAnnotationLine | This is the class that represents a line annotation. | 
| PDAnnotationLink | This is the class that represents a link annotation. | 
| PDAnnotationMarkup | This class represents the additonal fields of a Markup type Annotation. | 
| PDAnnotationPopup | This is the class that represents a popup annotation. | 
| PDAnnotationRubberStamp | This is the class that represents a rubber stamp annotation. | 
| PDAnnotationSquareCircle | This is the class that represents a rectangular or eliptical annotation
 Introduced in PDF 1.3 specification . | 
| PDAnnotationText | This is the class that represents a text annotation. | 
| PDAnnotationTextMarkup | This is the abstract class that represents a text markup annotation
 Introduced in PDF 1.3 specification, except Squiggly lines in 1.4. | 
| PDAnnotationUnknown | This is the class that represents an arbitary Unknown Annotation type. | 
| PDAnnotationWidget | This is the class that represents a widget. | 
| PDAppearanceCharacteristicsDictionary | This class represents an appearance characteristics dictionary. | 
| PDAppearanceDictionary | This class represents a PDF /AP entry the appearance dictionary. | 
| PDAppearanceStream | This class represents an appearance for an annotation. | 
| PDBorderEffectDictionary | This class represents a PDF /BE entry the border effect dictionary. | 
| PDBorderStyleDictionary | This class represents a PDF /BS entry the border style dictionary. | 
| PDExternalDataDictionary | This class represents an external data dictionary. | 
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