[rules-users] Difference between adding $ at the beginning of a variable

[suddeb]

Hi,
As I am very new to Drools, could you please tell me what is the difference
between adding a $ at the beginning of a variable and without $. 
For example:
rule "validate holiday"
when
   *$h1 : Holiday( `when` == "july" )*
then
   ......
end

and 

rule "validate holiday"
when
   *h1 : Holiday( `when` == "july" )*
then
   ......
end

Regards,
Sudipta Deb



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