* Formatters specify the layout of log records in the final output.
+Log event information is passed between loggers, handlers, filters and
+formatters in a :class:`LogRecord` instance.
Logging is performed by calling methods on instances of the :class:`Logger`
class (hereafter called :dfn:`loggers`). Each instance has a name, and they are
conceptually arranged in a namespace hierarchy using dots (periods) as
*format* keyword argument. For all options regarding how a format string is
constructed, see :ref:`formatter-objects`.
+The flow of log event information in loggers and handlers is illustrated in the
+.. image:: logging_flow.png