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Represents the "PtData" entry of the viewport dictionary
object.
It is an optional entry defined as part of the PDF 1.7 Extension
Level 3 specification.
It contains a PointDataElement.
For definitive details see:.
The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 260,
page 479.
Adobe Supplement to the ISO 32000, BaseVersion: 1.7,
ExtensionLevel: 3; Table: 8.109, page 48.
The ISO PDF
Specification, ISO 32000-2:2017 PDF 2.0; Table: 265, page 592.
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