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

category

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

Thing > Property > category

A category for the item. Greater signs or slashes can be used to informally indicate a category hierarchy.

Usage: Between 50,000 and 100,000 domains
Values expected to be one of these types
Text
Thing
Expected values defined in extensions
PhysicalActivityCategory - defined in the health-lifesci extension
Used on these types
Invoice
Offer
Product
Service
Used on types defined in extensions
Class - defined in the meta extension
PhysicalActivity - defined in the health-lifesci extension
Property - defined in the meta extension

Schema Version 3.3