Represents the "S" entry of the page label 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.

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

• D
• R
• r
• A
• a

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 159, page 375.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 161, page 456.

The style name determines how the numeric counter is formatted. D produces Arabic numerals; R and r produce upper and lower case Roman numerals; A and a produce upper and lower case alphabetic sequences. If absent the range uses only the prefix.