[rules-users] Is "or" allowed in a rule? Can I link the rules?

[Ingomar Otter]

 >1. Seems to me that the conditions in a rule are always connected  
with "AND" relation:
True.
AND is the default.

 >Is "or" allowed? I mean , can I express:  "if (C1 or C2 or C3) and  
C4, then D1" in 1 rule?
You can have an explicit OR,  see section 6.5.2.3 of the 4.0.7  
documentation.

> >Can I form a link of rules? Can rule A's decision (the Then part)  
> be rule B's condition (The When part)?
>
> >for instance:
> >rule A: if C1, C2, C3 then D1
> >rule B: if D1, C4 then D2
usually the consequence (RHS) of would modify facts which you can test  
in rule B.
A common way is to assert a fact.

 >When the complexity increases, the number of rules explodes.
What's your definition of "explodes"? This suggest that you should  
have another go at your rule/fact model.

Cheers,
   --Ingomar


Am 24.07.2008 um 17:25 schrieb Yu Wang:

> I'm a beginner user of Jboss, please bear with my maybe dumb  
> questions:
>
> 1. Seems to me that the conditions in a rule are always connected  
> with "AND" relation:
>
> such as the following rule
>
> if C1
>   C2
>   C3
> then D1
>
> it means "if C1 and C2 and C3, then D1"
>
> Is "or" allowed? I mean , can I express:  "if (C1 or C2 or C3) and  
> C4, then D1" in 1 rule?
>
> Right now, I can only use 3 rules to express it:
>
> if C1
>   C4
> then D1
>
> if C2
>   C4
> then D1
>
> if C3
>   C4
> then D1
>
>
> 2. Can I form a link of rules? Can rule A's decision (the Then part)  
> be rule B's condition (The When part)?
>
> for instance:
> rule A: if C1, C2, C3 then D1
> rule B: if D1, C4 then D2
>
>
> When the complexity increases, the number of rules explodes.
> I browsed the document and didn't find a clue. I'm using the 4.0.7.
> Your help is highly appreciated.
>
>
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