[rules-users] How to write DSL for relation between two objects

Hi, I'd like to write in my DSL in LHS questions as rule "Relation" when relation between "a" and "b" is "x" then do something end The "relation between..." can be rewritten as relation between "{var1}" and "{var2} is "{relation}" = $a: A(name == "{var1}") $b: A(name == "{var2}") eval(A.getRelation($a, $b) == "{relation}") But the problem is that if I write when relation between "a" and "b" is "x" relation between "c" and "d" is "y" then... the variables $a and $b collide. It could be solved as to use $a{var1} instead of $a, but this forces the user to use only names without spaces and special characters. And the bigger problem is that I still cannot write relation between "a" and "b" is "x" or relation between "a" and "b" is "y" Is there any way to make the variables "local" withing some block? Or do I need to force user to manually set names for those variables? Thanks for any suggestions Flavius