Represents the "N" entry of the 3d node dictionary object.

It is a required entry defined as part of the PDF 1.0 specification.

It contains a string representing a PDF string object.

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 312, page 538.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 323, page 671.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 9.47, page 58.

The N entry holds the node name as a byte string that identifies the node within the 3D model hierarchy. The name must match a node name defined in the 3D model data.