JESS: question from newbie

Hi, I'm starting learning JESS and I got a question while I was reading the jess document.

Could any one explain what "<-" means in the following code?

(defrule example-5
    ?fact <- (a "retract me")
    =>
    (retract ?fact))

I tried to look through the jess document, but couldn't find the answer.

I also want to know if there's a good way of starting jess programming. I mean if there's a kind of tutorial of jess, I could get a better idea.

Thanks in advance.

Young-Jin Lee

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