log4plus配置问题,疑问多多

log4cplus.appender.SERVICE_ERROR_LOG=log4cplus::RollingFileAppender
log4cplus.appender.SERVICE_ERROR_LOG.File=${SS_SERVICELOG}/service_error.log
log4cplus.appender.SERVICE_ERROR_LOG.MaxFileSize=209715200
log4cplus.appender.SERVICE_ERROR_LOG.ImmediateFlush=TRUE
log4cplus.appender.SERVICE_ERROR_LOG.MaxBackupIndex=20
log4cplus.appender.SERVICE_ERROR_LOG.layout=log4cplus::PatternLayout
log4cplus.appender.SERVICE_ERROR_LOG.layout.ConversionPattern=%m%n
log4cplus.appender.SERVICE_ERROR_LOG.filters.1=log4cplus::spi::LogLevelMatchFilter
log4cplus.appender.SERVICE_ERROR_LOG.filters.1.LogLevelToMatch=INFO
log4cplus.appender.SERVICE_ERROR_LOG.filters.1.AcceptOnMatch=TRUE
log4cplus.appender.SERVICE_ERROR_LOG.filters.2=log4cplus::spi::DenyAllFilter

http://www.fx114.net/qa-172-17091.aspx