This is an implementation of JBoss Logging using the Equinox ExtendedLogService.
In plain words it makes all code that uses JBoss Logging log to the Equinox .metadata/.log log file. It does this by redirecting all the log messages to the Equinox ExtendedLogService. This is mostly interesting for code that runs inside Eclipse RCP applications. This does not make Equinox use JBoss Logging.