Therefore, a dog may or may
not have a tail. Does that mean that I just have an empty instance var?
If it's optional, why not have code that does this:
if ( not structKeyExists(variables,'tail') ) { ... }
Presumably you need special handling for the "" value of tail anyway?
Sean A Corfield -- http://www.corfield.org/blog/
"If you're not annoying somebody, you're not really alive." -- Margaret Atwood
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