The Rule language

Now that we have executed our first rule, it is time to learn a little bit more about the language that we use to define them. In order to do this, we will start by analyzing the rule that we wrote previously and then we will start creating more advanced rules.

All the rules and examples contained in this section can be found in the chapter-02/chapter-02-kjar/ project. We will use this project throughout the rest of the chapter to store different rules.

As it was mentioned in the first chapter, the rule structure is composed of the conditions and consequence, as follows:

rule "name"
when
    (Conditions) - also called Left Hand Side of the Rule (LHS)
then
    (Actions/Consequence) - also called Right Hand Side of the Rule (RHS)
end

The Conditions (LHS) of the rule are written following the DRL language, which for the sake of simplicity, will not be entirely explained in here. We will be looking at the most common usage of the DRL language throughout the book examples...