Represents the "O" entry of the 3d view dictionary object.
It is an optional entry defined as part of the PDF 1.0
specification.
It contains a FormXObjectElement.
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.
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