context param in web.xml

I am try to study the code a open source web application
In the web.xml there is a context parameter defined as
  <context-param>
    <param-name>FS_traceLevel</param-name>
    <param-value>@TOMCAT_LOG_LEVEL@</param-value>
  </context-param>

and in the servlet the values is being fetched using
 String sInitParameter = servlet.getServletContext().getInitParameter( "FS_traceLevel" );

i want to know where is the value of @TOMCAT_LOG_LEVEL@ declared and what does this @ symbol mean here?
Thanks
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thomas908Asked:
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petmagdyConnect With a Mentor Commented:
I think the value is Set by the ant script used to build Tomcat, look into the build.xml u will find that the ant script replaces @TOMCAT_LOG_LEVEL@ with the real value
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thomas908Author Commented:
thanks for the help
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