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Represents the "M3DREF" entry of the external data dictionary
object.
It is a required entry defined as part of the PDF 1.7 Extension
Level 3 specification.
It contains a D3DMeasurementElement.
For definitive details see:.
The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 170,
page 391.
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.
The ISO PDF
Specification, ISO 32000-2:2017 PDF 2.0; Table: 173, page 477.
Adobe Supplement to the ISO 32000, BaseVersion: 1.7,
ExtensionLevel: 3; Table: 9.39g, page 76.
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