Expand the event instances for an RDATE or EXDATE property
RFC2068, 14.25: If none of the entity tags match, or if "*" is given and no current entity exists, the server MUST NOT perform the requested method, and MUST return a 412 (Precondition Failed) response.
This function launches an error
Expand the event instances for an RRULE property
Returns the result of the LDAP query
Accessor for the read proxy group
Render XML for a single Principal (user) from the DB
The raw data sent along with the request
Render XML for this resource
Return general server-related properties for this URL
Returns the definitive resource_id for this resource - usually a dav_id