core + attic (Attic Area): these terms have been either depricated from the core or extentions, or removed from pending as not accepted into the full vocabulary.

numberOfPages

Canonical URL: http://schema.org/numberOfPages

Thing > Property > numberOfPages

The number of pages in the book.

Usage: Between 1000 and 10,000 domains
Values expected to be one of these types
Integer
Used on these types
Book

Schema Version 3.2