[rules-users] how do I add not exists contraint in dslr

[maverik j]

I tried with same example as in
http://permalink.gmane.org/gmane.comp.java.drools.user/23689
just changed the exists in this example to not(exists....)

Regards,
-maverik

2011/1/11 Wolfgang Laun <wolfgang.laun at gmail.com>

> Don't use not(exists( X() )).
>    not( X() )
> means "there is no X". The error may be due to constraints, but you'd have
> to show us the entire DSLR condition and its DSL definition.
> -W
>
>
> 2011/1/11 maverik j <maverikj348 at gmail.com>
>
>>   Hi,
>>
>>   I have been trying to add not exists constraint in dslr but its failing
>> to parse the dslr. Here is what I am trying to do in DSLR
>>
>> [when][][*Tt*]here is at least one {entity}= not(exists {entity}:
>> {entity}())
>>
>> If I simply use the exists constraint here then it works well. But then
>> after adding not to it, its not getting parsed correctly.
>>
>> error I am geeting is:
>>
>> [10,27]: [ERR 102] Line 10:27 mismatched input ',' expecting ')' in rule
>> "Rule1" in pattern Person
>>
>> not sure whats going wrong here, if it is expected to work this way?
>>
>> thanks,
>>
>> -m
>>
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>>
>>
>
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