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.

discussionUrl

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

Thing > Property > discussionUrl

A link to the page containing the comments of the CreativeWork.

Usage: Between 10,000 and 50,000 domains
Values expected to be one of these types
URL
Used on these types
CreativeWork

Schema Version 3.4