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.

additionalNumberOfGuests

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

Thing > Property > additionalNumberOfGuests

If responding yes, the number of guests who will attend in addition to the invitee.

Usage: Fewer than 10 domains
Values expected to be one of these types
Number
Used on these types
RsvpAction

Schema Version 3.2