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.

PreOrder

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

Thing > Intangible > Enumeration > ItemAvailability :: PreOrder

Indicates that the item is available for pre-order, but will be delivered when generally available.

Usage: Between 10 and 100 domains

Schema Version 3.2