[rules-users] DSL parsing List of Strings

Hi, how I can define a list in a DSL-file? So user should define a list of comma separated reations (Strings)in a DSL-rule-file, like this {"r1","r2","r3"} This list should be used as parameter for "in"-command. I always get: mismatched input '{' expecting ') no viable alternative at input '{' in rule DSLR: when Reaction appears {"r1","r2","r3"} DSL: [condition][]Reaction appears {reactions}= $interactionrequest : Interactionrequest($state in ({reactions})) Thanks for advice Thorsten