[rules-users] decision tables and 'default' or 'else' conditions

[Edson Tirelli]

    Joost,

    Unfortunatelly, there is no feature implemented for that. But we are 
discussing, specially the semantics we want to define to such statements 
( we call them "else" and "otherwise" ).
    If you have a real use case and you can describe it for us, it may 
help on deciding which way to go, and at the same time fullfil your 
needs in the future.

    Our biggest questions are:

* should the "else/otherwise" part be fired only once if no rule is 
triggered? or should it fire for each tuple that does not trigger 
previous rules? What if rules in the "otherwise" group use different 
tuples to activate?

* should "else/otherwise" apply to the whole LHS of the rules? Or should 
there be a way to specify only part of the LHS (like a tag)?

    Input welcome.

    Edson

Joost de Vries wrote:

> Hi,
>
> We're using excel decision tables to specify our business rules.
> In one column we enumerate several condition values and describe a 
> specific effect.
> We'd like to offer business analysts te possibility of describing 
> succinctly what the effect is 'for all other values'.
> That could be described as an 'else' or 'default' rule.
>
> In other words; we don't want to burden business analysts with the 
> necessity to enumerate all other values.
>
> What is the right way to do that?
>
> Thanks for you help.
>
> groetjes,
> Joost
>
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 Edson Tirelli
 Software Engineer - JBoss Rules Core Developer
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