[logback-user] Is there a way to define a variable by making a call to Joran?

[Benson Margulies]

I looked quickly through the class stack for the Joran configurator,
but I didn't spot anything. Is there something I'm missing?

I want to have an XML file with some variable references, configure
explicitly with Joran, and set some vars. I can write code to edit the
XML or to set system props, but I was hoping for something cleaner.