According to RFC 4918, there is two types of response elements:

Type 1 contains one or more href and one status child elements.

Type 2 contains one href and one or more propstat child elements.

Both types may contain further optional elements.

For Type 1, sabre/dav inserts a spurious propstat element, which
violated the element definition by RFC 4918.

Analog to addressbook-query report, multiget also supports returning
only partial address objects. This can be useful to carddav clients to
have fast syncs by excluding large properties like PHOTO and fetching
those only when needed.