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Represents the "NA" entry of the 3d view dictionary object.
It is an optional entry defined as part of the PDF 1.7
specification.
It contains an array which contains D3DNodeElements.
For definitive details see:.
The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 304,
page 522.
Adobe Supplement to the ISO 32000, BaseVersion: 1.7,
ExtensionLevel: 3; Table: 9.39, page 57.
The ISO PDF
Specification, ISO 32000-2:2017 PDF 2.0; Table: 344, page 707.
Adobe Supplement to the ISO 32000, BaseVersion: 1.7,
ExtensionLevel: 3; Table: 9.51f, page 93.
The NA entry holds an array of 3D node dictionaries that
override the visibility, opacity, or transformation of specific
model nodes in this view.
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