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

color

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

Thing > Property > color

The color of the product.

Usage: Fewer than 10 domains
Values expected to be one of these types
Text
Used on these types
Product

Source

http://www.w3.org/wiki/WebSchemas/SchemaDotOrgSources#source_GoodRelationsTerms

Schema Version 3.2