[logback-user] variable substitution in logback 0.9.9

Hi, Does variable substitution works in a whole logback.xml? I'm using version 0.9.9. It works here: <configuration> <include file="${filec}"/> </configuration> and it works here: <include file="${user.pal}" /> but not here: <root> <level value="${logger.level}" /> <appender-ref ref="redirectConsole" /> </root> Should it work also in <level section? I'm asking because I'd like to configure different levels on different machines Thanks