[logback-user] Is it possible to acces MDC values as properties?

[Stefan Eder]

Hi,

applies to Logback classic 1.0.0.

Is it possible to acces MDC values as properties like this:
<file>${catalina.base}/logs/exchanges/${breadcrumbId}-gsem.log</file>
<encoder>
<pattern>...</pattern>
</encoder>
where 'breadcrumbId' is mapped in the MDC.

The above example produces a file named breadcrumbId_IS_UNDEFINED-gsem.log.
The snippet is used in a sifting appender, but 'breadcrumbId' is not the 
descriminator.

Do I have to use another notation or do I have to implement 
ch.qos.logback.core.spi.PropertyDefiner?

Thanks,
Stefan