Represents the "CS" entry of the projection dictionary object.

It is an optional entry defined as part of the PDF 1.0 specification.

It contains a string representing a PDF name object.

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

This item may take one of the following valid values:.

• XNF
• far
• ANF

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 305, page 524.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 316, page 655.

The CS entry names the projection type: P for perspective projection (objects appear smaller with distance) or O for orthographic projection (parallel projection with no perspective foreshortening).