No difference, it was/is just used a lot in examples and advice given on here so has sort of become an unofficial standard.

Some argue the presence of "$" helps identify bindings when scanning DRL.

On 15 January 2013 20:04, suddeb <sudipta.deb@gmail.com> wrote:
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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