The CalDAV standard is defined in RFC 4791 and is based on WebDAV (RFC 4918) which again is based on HTTP (RFC 2616). The iCalendar standard is specified in RFC 5545. Essentially, CalDAV is the protocoll describing how data, which is formatted according to the iCalendar specification, is being down- and uploaded. This is analogue to HTTP and HTML.
To realise a parent-child relationship, the iCalendar property RELATED-TO can be applied on a child, refering to the parent entry.
To realise attachements, the iCalendar property ATTACH can be used
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