[rules-users] Drools basic questions.

[Mithun]

I am new to drools, so i have some basic doubts. 

1. what does the dollar sign represent in the following rule? what is the
difference when u prefix and dont prefix a variable with the dollar sign?
    - $stilton : Cheese( type == "stilton" )
      Cheesery( cheeses contains $stilton )

2. what is the difference between the following rule statements ?
    - cheapStilton : Cheese( type == "stilton", price < 10 ) and
    - cheapStilton : Cheese( type == "stilton", price < newPrice)

   how does the rule base get access to the variable newPrice, in the above
rule statement? Please help.

Thank you.
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