XML entity references can be used for that purpose and are defined in the XML
Recommendation (http://www.w3.org/TR/xml/#sec-references).
<!DOCTYPE log4j:configuration
[
<!ENTITY logdir "c:/data/logfiles">
]>
<log4j:configuration>
...
<param name="file" value="&logdir;"/>
...
</log4j:configuration>
On Feb 20, 2011, at 6:35 AM, Thomas Wiedmann wrote:
> Hello,
>
> usually in flat plain text log4j.config files global system properties can be
> defined, which may be referenced in the configuration of different appenders,
> e. g.
>
> log4j.logdir=C:/Data/logfiles
> ...
> log4j.appender.MyAppender1.File=${log4j.logdir}/MyAppender1.log
> ...
> log4j.appender.MyAppender2.File=${log4j.logdir}/MyAppender2.log
>
> I found this is a very convenient way to define (and to administer) such
> parameters only once globally for the entire log configuration and to use it
> on several references as here in the appenders configuration.
>
> How can such global system properties be defined in xml-based configuration
> files (log4j.xml)?
> Where is it documented? I'd found no hint about it.
>
> Thomas Wiedmann
>
>
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