[ CCode ( cname = "E_BOOK_BACKEND_PROPERTY_SUPPORTED_FIELDS" ) ]
[ Version ( since = "3.2" ) ]
public const string BOOK_BACKEND_PROPERTY_SUPPORTED_FIELDS
Provides comma-separated list of supported fields by the book backend.
Attributes other than those listed here can be discarded. This can be used to enable/show only supported elements in GUI.
The field_id can be used to transform the field name into an ContactField.