将值对象改为引用对象 Change Value to Reference
SAMPLE_VAR1现在已经设置为动态的值，如引用中定义的那样。
SAMPLE_VAR1 is now set to the dynamic value, as defined in the reference.
如果该属性的值为true，那么将machine实例的一个引用分配给machine标识符。
If this evaluates to true, then a reference to the machine instance is assigned to the machine identifier.
如果您将此元素设置为True(缺省值)，并且finder返回给bean一个引用，则WebLogic Server会立即将该bean加载到缓存中。
If you set this element to True (the default) and a reference to a bean is returned by the finder, then WebLogic Server immediately loads the bean into the cache.
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