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

parentItem

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

Thing > Property > parentItem

The parent of a question, answer or item in general.

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

Schema Version 3.2