The mechanism(API) provided by ILOG to execute rules
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Rule Container
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Rule Engine
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Ruleset
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Rule Server
The Rule Engine is the core API/mechanism in ILOG BRMS that executes business rules. It takes rule definitions, evaluates conditions against input data, and executes the appropriate actions. A Rule Container is a storage mechanism, a Ruleset is a collection of rules, and a Rule Server handles deployment and management - but only the Rule Engine actually executes the rules.
In ILOG's BRMS, the Rule Engine is the runtime API/mechanism that loads a ruleset and actually fires the rules against application data. A Rule Container or Repository is just where rules are stored and organized, not the execution mechanism, and a Rule Server hosts engines for scalability rather than being the execution API itself.