[rules-users] New Operators

[Ahmed Hafsi]

Hi Guys ,
I am using the latest version of drools fusion .
Is it possible to create new operators ? For example I want to make the
logic rule OR
i.e : 
a :- b;c.
I know I can make a rule for it like this ::

rule _Rule
when
$a Event()
$b Event(this after $a || this before $a)
then
//..
end

can I embed this rule to make more complex logical rules ? say for example I
want to represent the following rule :
Exp :- (a AND b AND c) OR (d AND e)

One more question :: 

how can I represent the not operator ? i.e : 
a :- b AND (NOT(b))

Thanks,
Khalil Hafsi