[rules-users] DAO call in LHS

[techy]

though I referred other thread about this topic, I'm not successful to make a
dao call.
I beg your pardon to ask again.

1. I want to pass the fact object to the dao function which returns boolean.
I tried following rule and getting "
Unexpected token '$fact'" as eclipse compilation error. Please guide with
right syntax. 
global RuleDAO dao;

rule "test DAO call"
 $fact : Fact(some condition)
  fact : Fact(dao.isValid($fact))
then 
#do something
end

2. Will be there any performance issue for above kind of rule?

Thanks

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