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18.19. DSL Translation Components
| Name | Duty |
|---|---|
| Parser | The parser reads the rule text in a DSL line by line and tries to match some of the Language Expression. After a match, the values that correspond to a placeholder between curly braces (for example, {age}) are extracted from the rule source. |
| Placeholders | The placeholders in the corresponding rule expression are replaced by their corresponding value. For example, a natural language expression maps to two constraints on a fact of type Person based on the fields age and location. The {age} and {location} values are then extracted from the original rule text. |
Note
If you do not wish to use a language mapping for a particular rule in a drl, prefix the expression with > and the compiler will not try to translate it according to the language definition. Also note that Domain Specific Languages are optional. When the rule is compiled, the .dsl file will also need to be available.
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