+\subsection log_lay 1.4 Message layouts
+
+The message layouts are the elements in charge of choosing how each message
+will look like. Their result is a string which is then passed to the appender
+attached to the category to be displayed.
+
+For now, there is two layouts: The simple one, which is good for most cases,
+and another one allowing users to specify the format they want.
+
+Here are the existing format directives:
+
+ - %%: the % char
+ - %n: platform-dependant line separator (LOG4J compliant)
+ - %e: plain old space (SimGrid extension)
+
+ - %m: user-provided message
+
+ - %c: Category name (LOG4J compliant)
+ - %p: Priority name (LOG4J compliant)
+
+ - %h: Hostname (SimGrid extension)
+ - %t: Process name (LOG4J compliant -- thread name in LOG4J)
+ - %I: Process PID (SimGrid extension)
+
+ - %F: file name where the log event was raised (LOG4J compliant)
+ - %l: location where the log event was raised (LOG4J compliant, like '%F:%L')
+ - %L: line number where the log event was raised (LOG4J compliant)
+ - %M: function name (LOG4J compliant -- called method name here of course).
+ Defined only when using gcc because there is no __FUNCTION__ elsewhere.
+
+ - %b: full backtrace (Called %throwable in LOG4J).
+ Defined only when using the GNU libc because backtrace() is not defined
+ elsewhere.
+ - %B: short backtrace (only the first line of the %b).
+ Called %throwable{short} in LOG4J, defined where %b is.
+
+ - %d: date (UNIX epoch)
+ - %r: application age (time elapsed since the beginning of the application)
+
+
+If you want to mimick the simple layout with the format one, you would use this
+format: '[%h:%i:(%I) %r] %l: [%c/%p] %m%n'. This is not completely correct
+because the simple layout do not display the message location for messages at
+priority INFO (thus, the fmt is '[%h:%i:(%I) %r] %l: [%c/%p] %m%n' in this
+case). Moreover, if there is no process name (ie, messages comming from the
+library itself, or test programs doing strange things) do not display the
+process identity (thus, fmt is '[%r] %l: [%c/%p] %m%n' in that case, and '[%r]
+[%c/%p] %m%n' if they are at priority INFO).
+
+For now, there is only one format modifyier: the precision field. You can for
+example specify %.4r to get the application age with 4 numbers after the radix.
+
+\subsection log_hist 1.5 History of this module