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.

dependencies

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

Thing > Property > dependencies

Prerequisites needed to fulfill steps in article.

Usage: Between 10 and 100 domains
Values expected to be one of these types
Text
Used on these types
TechArticle

Schema Version 3.3