core + meta (Meta Extension): terms used within schema.org for schema definitions.

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
Class
Invoice
Offer
Product
Property
Service
Used on types defined in extensions
PhysicalActivity - defined in the health-lifesci extension

Schema Version 3.2.1