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.

reservationId

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

Thing > Property > reservationId

A unique identifier for the reservation.

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

Schema Version 3.4