The following table has been used to initialize the components registry.
+-----------+---------+-------------------------+ | Component | Status | Reference | +-----------+---------+-------------------------+ | VCALENDAR | Current | RFC 5545, Section 3.4 | | | | | | VEVENT | Current | RFC 5545, Section 3.6.1 | | | | | | VTODO | Current | RFC 5545, Section 3.6.2 | | | | | | VJOURNAL | Current | RFC 5545, Section 3.6.3 | | | | | | VFREEBUSY | Current | RFC 5545, Section 3.6.4 | | | | | | VTIMEZONE | Current | RFC 5545, Section 3.6.5 | | | | | | VALARM | Current | RFC 5545, Section 3.6.6 | | | | | | STANDARD | Current | RFC 5545, Section 3.6.5 | | | | | | DAYLIGHT | Current | RFC 5545, Section 3.6.5 | +-----------+---------+-------------------------+