Note that when the var and scope attributes are present, the type of data structure used by JSTL to represent the parsed document is implementation-specific, allowing for vendor optimization.
注意，当var和 scope 属性存在时，JSTL用于表示分解后的文件的数据结构类型以实施为导向，从而厂商可以对其进行优化。
It is designed to be readily augmented with vendor specific information and data models; it thereby provides a highly flexible and extensible modeling solution.
这样设计是为了便于厂家信息和数据模型的扩展；以此提供一个更具灵活性的和可扩展性的模型方法。
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