Represents the "S" entry of the box style 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 "S" if no value has been provided.

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

• S
• D

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 361, page 631.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 397, page 811.