{
  "resourceType" : "Slot",
  // from Resource: id, meta, implicitRules, and language
  // from DomainResource: text, contained, extension, and modifierExtension
  "identifier" : [{ Identifier }], // External Ids for this item
  "type" : { CodeableConcept }, // The type of appointments that can be booked into this slot (ideally this would be an identifiable service - which is at a location, rather than the location itself). If provided then this overrides the value provided on the availability resource
  "schedule" : { Reference(Schedule) }, // R!  The schedule resource that this slot defines an interval of status information
  "freeBusyType" : "<code>", // R!  busy | free | busy-unavailable | busy-tentative
  "start" : "<instant>", // R!  Date/Time that the slot is to begin
  "end" : "<instant>", // R!  Date/Time that the slot is to conclude
  "overbooked" : <boolean>, // This slot has already been overbooked, appointments are unlikely to be accepted for this time
  "comment" : "<string>" // Comments on the slot to describe any extended information. Such as custom constraints on the slot
}