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Represents the "ExData" entry of the markup annotation
object.
It is an optional entry defined as part of the PDF 1.7
specification.
It contains an ExternalDataElement.
For definitive details see:.
The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 170,
page 393.
Adobe Supplement to the ISO 32000, BaseVersion: 1.7,
ExtensionLevel: 3; Table: 8.21, page 38.
The ISO PDF
Specification, ISO 32000-2:2017 PDF 2.0; Table: 332, page 695.
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