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.

bestRating

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

Thing > Property > bestRating

The highest value allowed in this rating system. If bestRating is omitted, 5 is assumed.

Usage: Between 250,000 and 500,000 domains
Values expected to be one of these types
Number
Text
Used on these types
Rating

Schema Version 3.4