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 |
+-----------+---------+-------------------------+