This might be important in large applications that support many different types of functionality, since the memory for the object is only allocated if the class is actually used.
这在支持很多不同类型功能的大型应用程序中可能很重要，因为只有在实际使用该类时，才会分配对象的内存。
Support for XML and LOB (large object) data types of any size.
支持xml和lob(大对象)数据类型。
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