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The EAI Dispatch Service has a three-layer rules hierarchy as illustrated in Figure 2.
Rules are individual entities in a rule set. Each rule consists of data transformations, search expression grammar, and zero or more rule transforms. You define rules by using search expression grammar to establish how you want an input message to be routed. For details, see Search Expression Grammar.
A transform specifies how the intermediate output is going to be generated before it is dispatched to the service and the method you specified in the rule. For details, see Output Transformation.
|Business Processes and Rules: Siebel eBusiness Application Integration Volume IV|