Although SDO 1.0 aims at the same data abstraction goal, it has several major drawbacks, the main one being a lack of helper classes, such as XSDHelper, XMLHelper, and so on.
尽管SDO 1.0以相同的数据抽象为目标，但有几个大的缺点，其中主要的一点是缺少helper类，如xsdhelper, XMLHelper等。
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