This provides the flexibility in type system design to map null objects to their corresponding XML types.

这就为类型系统设计提供了将空(null)对象映射为其对应的xml类型的灵活性。

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In addition, avoid returning objects that are null or in an invalid state.

此外，避免返回空对象或者状态无效的对象。

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Weakly-typed collection objects, arrays containing null elements, and certain native data types all pose special problems for interoperability. Specifically

弱类型的集合对象、包含空元素的数组和特定的本地数据类型都给互操作性带来一定的问题，特别是

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