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Defines the numbering style for page labels.
DecimalArabic: 0;
Decimal Arabic numerals.
LowercaseLetters: 4;
Lowercase letters (a to z for the first 26 pages, aa to zz for the next 26, and so on).
LowercaseRoman: 2;
Lowercase Roman numerals.
Unknown: 6;
Unknown numbering style.
Unset: 5;
No numbering style; page labels consist solely of a label prefix with no numeric portion.
UppercaseLetters: 3;
Uppercase letters (A to Z for the first 26 pages, AA to ZZ for the next 26, and so on).
UppercaseRoman: 1;
Uppercase Roman numerals.