Logger has a great advantage of simplicity for XPages developers. If you
are using OpenNTF Domino API, you can already use it by now. Even you don't
want to install any plugins for your environment, you can easily import
necessary libraries into your NSF and it will work.
On the other hand, XLogback provides more JAVA-ish way for logging.
So XLogback provides more universal logging mechanism for any Java library
you have developed, with the ability to move your code into totally different
Java environment. Also appender support is significant. Different types
of appenders can be defined in parallel to OpenLog. Check Logback web site
for very interesting scenarios."
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