Identifies the calendar user type of the associated principal resource.
Same values allowed for the iCalendar "CUTYPE" property parameter defined in Section 3.2.3 of [RFC5545].
This property MAY be protected.
PROPFIND behavior: This property SHOULD NOT be returned by a PROPFIND DAV:allprop request (as defined in Section 14.2 of [RFC4918]).
COPY/MOVE behavior: This property value SHOULD be preserved in COPY and MOVE operations.
Clients can query principal resources in order to look up "Attendees" available on the server. When doing this, it is useful to know, or restrict the query to, certain types of calendar users (e.g., only search for "people", or only search for "rooms"). This property MAY be defined on principal resources to indicate the type of calendar user associated with the principal resource. Its value is the same as the iCalendar "CUTYPE" property parameter that can be used on "ATTENDEE" properties. This property SHOULD be searchable using the DAV:principal- property-search REPORT. The DAV:principal-search-property-set REPORT SHOULD identify this property as such.