Thanks for the fast response. 
I am using excel decision tables and can't set globals with values from the
cells.
I can only use brown fields and through $param refer to the contents of the
cell.
That leads me to a question. 
Can I define $collection in the when statement?
something like this:

when
  exists ( 
  $name: String from ('a','b','c') 
  not Object(name == $name) 
  )  
then

Much obliged. 
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