[sapphire-dev] Best way to model enum

[Ling Hao <ling.hao@xxxxxxxxxx>]

One of the schema that I'm trying to model is an element named 
"destination" in which the valid values are "stdout", "stderr", "jdk", 
"log4j", or a file name.  I have modeled this element by an enum with 
CustomXmlValueBinding as a switch panel, with a file name. Now in a 
later version, a new valid value "slf4j" is introduced. What is the best 
way to model this change?  Obviously I would like to avoid big if blocks.

Thanks,
Ling