Changes

The back-end of Lightning and Sunbird consists largely of a series of XPCOM components that have been designed specifically for calendar-related purposes. In most cases, these components implement a specific interface defined in an IDL file. All of these interface definitions reside in [http://lxr.mozilla.org/mozilla/source/calendar/base/public/ public/] and contain substantial documentation on their use and implementation. The back end is entirely shared between all calendar applications and extensions.  == SQLite ==Sunbird/Lightning are now using the new mozStorage system to keep track of the majority of user-enterred information. There are several tables stored in the database. The tables concerning calendar locations and preferences are defined [http://lxr.mozilla.org/mozilla/source/calendar/base/src/calCalendarManager.js#119 here] and those concerning events in individual calendars are defined [http://lxr.mozilla.org/mozilla/source/calendar/providers/storage/calStorageCalendar.js#1829 here].