`TPDFPagesObject`
pt	ro	PageCount
pt	ro	ChildCount
pt	ro	ChildRef
pt	ro	ChildObject

`TPDFIndirect`
	ro	Document
	ro	Stream
		UnfilteredStream
		ObjectID
		ObjectGeneration
	ro	ObjectDict
	ro	ObjectType
		ObjectPositions

`TPDFContainer`
	ro	Count
		Objects

`TPDFObject`