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.

episodeNumber

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

Thing > Property > position > episodeNumber

Position of the episode within an ordered group of episodes.

Usage: Between 1000 and 10,000 domains
Values expected to be one of these types
Integer
Text
Used on these types
Episode
Super-properties
position

Schema Version 3.2