Represents the "NR" entry of the 3d view dictionary object.

It is an optional entry defined as part of the PDF 1.7 specification.

It contains a bool representing a PDF boolean object.

The PDF specification states that this item assumes a value of false if no value has been provided.

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.