How the numeric portion of a page label is written: a page label dictionary's S entry.
public enum PdfPageLabelStyle
ISO 32000-2 §12.4.2, Table 161.
kind:method, kind:property, kind:ctor. Press Esc to clear.ArabicDecimal arabic numerals (D).LowercaseLettersLowercase letters, a to z, then aa to zz, and so on (a).LowercaseRomanLowercase roman numerals (r).NoneNo numeric portion: the label is the prefix alone (S absent).UppercaseLettersUppercase letters, A to Z, then AA to ZZ, and so on (A).UppercaseRomanUppercase roman numerals (R).