XSLT, 2nd Edition

Numbers

N

All numbers, including alternate forms such as circled (Unicode character ①, which is the circled digit one) and parenthesized (Unicode character প, the parenthesized digit one).

Nd

Decimal digits (as opposed to Ⅶ, which is the Unicode character for the Roman numeral seven).

Nl

Numbers as letters (as opposed to digits; the aforementioned Unicode character Ⅶ character applies here).

No

Other numeric characters, such as ½, which is the single character for the fraction ½.