There are a number of key standards that make up the CalDAV protocol. CalDAV is based on WebDAV which is based on HTTP and it uses iCalendar and iTIP for calendar data and calendar operations. The IETF has a mailing list for discussion of the CalDAV protocol.
CalDAV
- CalDAV and CalDAV-Related
- CalDAV Use Cases (CalConnect document)
- CalDAV Scheduling Requirements (CalConnect document)
iCalendar
Other Useful Calendaring Referencess
- Calendaring Glossary (CalConnect document)
- An Introduction to Internet Calendaring (CalConnect document)