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In the above XML the value of the param name="expression" node, personBean.carModels.length > 0, will be evaluated by the framework as a Java statement. The part personBean.carModels tells the framework to call the getCarModels method of class Person. That method returns an Array. Since class Array has a length attribute, the framework will call get the value of the length attribute of the Array returned by the getCarModels method.

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