[jboss-jira] [JBoss JIRA] Commented: (JBRULES-1064) "->" notation for predicates missing in documentation

Tue Aug 7 21:40:00 EDT 2007

    [ http://jira.jboss.com/jira/browse/JBRULES-1064?page=comments#action_12371401 ] 

Mark Proctor commented on JBRULES-1064:
---------------------------------------

-> is now deprecated, its not just needed now.

Person( girlAge : age, sex = "F" )
Person( boyAge : age -> ( girlAge.intValue() == boyAge.intValue() + 2 ), sex = 'M' ) 

is now, notice the boyAge does not need binding, as it will determine and bind "age" as part of the autovivification process.
Person( girlAge : age, sex = "F" )
Person( eval( girlAge == age + 2 ), sex = 'M' ) 

You can ofcourse still still bind the boyAge, but generally its not preferred any more. Basically predicates where where focused on a single field are no longer needed as we determine the used and bound fields on the fly, we also now call then inline-eval. Predicate, while the traditional name, was dropped, this is partly in preparation for when we start to support backward chaining and will use the term predicate in the prolog sense.
Person( boyAge : age, eval( girlAge.intValue() == boyAge.intValue() + 2 ), sex = 'M' ).

I'll close this one off in a day or so, if I don't hear any further feedback.

> "->" notation for predicates missing in documentation
> -----------------------------------------------------
>
>                 Key: JBRULES-1064
>                 URL: http://jira.jboss.com/jira/browse/JBRULES-1064
>             Project: JBoss Rules
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: Documentation
>    Affects Versions:  4.0.0.GA
>            Reporter: Dr. Gernot Starke
>         Assigned To: Mark Proctor
>            Priority: Minor
>
> the notation "->" for adressing complex terms is missing from 4.0.0 documentation.
> It has been "return value operator" in 3.0.6:
> <quoted from 3.0.6>
> Example 3.13. Return Value operator
> Person( girlAge : age, sex = "F" )
> Person( boyAge : age -> ( girlAge.intValue() == boyAge.intValue() + 2 ), sex = 'M' )
> </quoted>

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