[rules-users] Abstracting Rules using extends

[Arul Prashanth]

Thanks Laune for your insight. 

1. The idea of having RuleConstant in the workingMemory is that the
constants are defined in a drl and is being inserted into the working memory
by a high salience rule. This is to reduce the effort in actual  application
build and deployment rather just package the rules and place the PKG file.
On a longer run the rules  will be maintained by a different team who prefer
working only in DRL's and not in java files  . I did considering them to be
access as Global variables but wheren't able to access in LHS. Hence
reverted back to adding them in working memory.

/declare RuleConstant
   COUPE			: String = "C";
   SEDAN			: String = "S";
end/

2. We did consider having the Vehicle object as fact but there were
requirements that required us to move back and forth a list of vehicles,
like if a vehicle is < 2011 and previous vehicle is > 1999 where vehicles
are ordered by purchase date compute X = Y. Though the below example doesn't
show case this scenario.



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- Prashanth
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