Actually, ruleflow-group is a way to define which rules to activate for a given node. It works like this in drools:
-you put a node with an argument defining a context (a ruleflow-group)
-the next time the rule engine is summoned, it will only fire the rules with the given ruleflow-group.
for example, when ruleflow-group is defined to "group-A" with a node, the next node that will fire rules will only fire like described below:
rule "will be activated"
ruleflow-group "group-A"
when
eval(true)
then
System.out.println("I'm activated");
end
rule "will not be activated"
ruleflow-group "group-B"
when
eval(true)
then
System.out.println("I'm not activated");
end