See: Description
| Class | Description | 
|---|---|
| PDAttributeObject | An attribute object. | 
| PDDefaultAttributeObject | A default attribute object. | 
| PDMarkedContentReference | A marked-content reference. | 
| PDMarkInfo | The MarkInfo provides additional information relevant to specialized
 uses of structured documents. | 
| PDObjectReference | An object reference. | 
| PDStructureElement | A structure element. | 
| PDStructureNode | A node in the structure tree. | 
| PDStructureTreeRoot | A root of a structure tree. | 
| PDUserAttributeObject | A User attribute object. | 
| PDUserProperty | A user property. | 
| Revisions<T> | 
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