Component/Property Presence
------------------- ----------------------------------------------
METHOD 1 MUST be "ADD"
VJOURNAL 1
DESCRIPTION 1 Can be null.
DTSTAMP 1
DTSTART 1
ORGANIZER 1
SEQUENCE 1 MUST be greater than 0
UID 1 MUST match that of the original journal
ATTACH 0+
CATEGORIES 0 or 1 This property MAY contain a list of values
CLASS 0 or 1
COMMENT 0 or 1
CONTACT 0+
CREATED 0 or 1
EXDATE 0+
EXRULE 0+
LAST-MODIFIED 0 or 1
RDATE 0+
RELATED-TO 0+
RRULE 0+
STATUS 0 or 1 MAY be one of DRAFT/FINAL/CANCELLED
SUMMARY 0 or 1 Can be null
URL 0 or 1
X-PROPERTY 0+
ATTENDEE 0
RECURRENCE-ID 0
VALARM 0+
VTIMEZONE 0 or 1 MUST be present if any date/time refers to
a timezone
X-COMPONENT 0+
VEVENT 0
VFREEBUSY 0
VTODO 0