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The Rule-Based Design Pattern
An alternative way of structuring a SAX application, which again has the objective of separating functions and keeping the structure modular and simple, is a rule-based approach. In general rule-based programs use an "Event-Condition-Action" model: they contain a collection of rules of the form "if this event occurs under these conditions, perform this action". Rule based programming can thus be seen as a natural extension of event-based programming.
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