Rule languages

Decision Server provides three rule languages: Business Action Language (BAL), ILOG® Rule Language (IRL), and Advanced Rule Language (ARL).

Business Action Language (BAL)
Use BAL to build rules. It includes operators for arithmetic operations, conditions, and expression comparison, literals to declare types of values, and punctuation for structure and clarity.
ILOG Rule Language (IRL)
The ILOG Rule Language (IRL) contains a set of keywords, and has its own syntax to structure each part of the rule. IRL does not support generics because IRL is not Java™. As a result you cannot use generics in: IRL, functions, BOM to XOM mapping, and initial/final actions.
Advanced Rule Language (ARL)
For each Business Action Language (BAL) expression that you create for BOM-to-XOM mapping in the decision engine, you can review its equivalent Advanced Rule Language (ARL) expression. ARL is a read-only rule language that is similar in syntax to Java 7.

Parent topic: Rule Designer reference