[rules-users] RuleBaseImpl Error - Help needed

[kingston]

Hi,
I am a beginner.

I am using DSL Syntax. I get errrors like 

org.drools.rule.InvalidRulePackage: unknown:7:48 mismatched token:
[@16,48:49='&&',<55>,1:48]; expecting type ')'
unknown:8:0  Unable to expand:  ;. Due to Expression was not expandable: 

	at org.drools.rule.Package.checkValidity(Unknown Source)
	at org.drools.reteoo.RuleBaseImpl.addPackage(Unknown Source)
	at student.DroolsStudent.main(DroolsStudent.java:50)


Where can i get the API documentation for RuleBaseImpl classs and other
classes like WorkingMemoryImpl ?
Are there any sets of DO's and DONT's to be followed frame rules in DSL
Syntax ?

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