A reply to an appointment request for a patient and/or practitioner(s), such as a confirmation or rejection. A reply to an appointment request for a patient and/or practitioner(s), such as a confirmation or rejection. If the element is present, it must have either a @value, an @id, or extensions This records identifiers associated with this appointment response concern that are defined by business processes and/ or used to refer to it when a direct URL reference to the resource itself is not appropriate. Appointment that this response is replying to. Indicates that the response is proposing a different time that was initially requested. The new proposed time will be indicated in the start and end properties. Date/Time that the appointment is to take place, or requested new start time. This may be either the same as the appointment request to confirm the details of the appointment, or alternately a new time to request a re-negotiation of the end time. Role of participant in the appointment. A Person, Location, HealthcareService, or Device that is participating in the appointment. Participation status of the participant. When the status is declined or tentative if the start/end times are different to the appointment, then these times should be interpreted as a requested time change. When the status is accepted, the times can either be the time of the appointment (as a confirmation of the time) or can be empty. Additional comments about the appointment. Indicates that this AppointmentResponse applies to all occurrences in a recurring request. The original date within a recurring request. This could be used in place of the recurrenceId to be more direct (or where the template is provided through the simple list of dates in `Appointment.occurrenceDate`). The recurrence ID (sequence number) of the specific appointment when responding to a recurring request. Accepted Declined Tentative Needs Action Entered in error If the element is present, it must have either a @value, an @id, or extensions