One page label range: the pages from StartPageIndex to the next range, labelled by one page label dictionary.
public sealed class PdfPageLabelRange
ISO 32000-2 §12.4.2, Table 161. Page i of a range that starts at page index k is labelled Prefix
followed by the number FirstNumber + (i − k) written in Style. Letters repeat rather
than carry: A to Z, then AA to ZZ, then AAA. Roman numerals beyond 3999 have no standard form; like Acrobat, an M is written per
thousand.
A live view over the page label dictionary. Deviations are repaired and reported when read: an unknown style reads as decimal
(PageLabelStyleInvalid), a start that is not a positive integer as 1 (an integral real as its value;
PageLabelStartInvalid), a prefix that is not a text string as empty and one holding U+0000 up to it
(PageLabelPrefixInvalid), a Type other than PageLabel is ignored (PageLabelInvalid).
kind:method, kind:property, kind:ctor. Press Esc to clear.DictionaryGets the page label dictionary.FirstNumberGets the number of the range's first page (St), at least 1; 1 when absent.PrefixGets the label prefix (P); empty when absent.StartPageIndexGets the index of the first page of the range (the number tree key).