| _caldav_error | A struct for storing error codes and messages |
| _CALDAV_SETTINGS | A struct used to exchange all user input between various parts of the library |
| _response | A struct used for returning messages from the library to users |
| config_data | Used to exchange user options to the library |
| debug_curl | A struct used to set internal options in the library |
| MemoryStruct | Used to hold messages between the CalDAV server and the library |
1.5.5