通常按值传递参数，除非希望过程能够更改其在调用代码中的值。

Normally you pass a parameter by value, unless you want the procedure to be able to change its value in the calling code.

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重要事项对于引用类型，按值传递参数会得到对所传递对象的引用的副本。

For reference types, if you pass a parameter by value, it results in a copy of the reference to an object being passed.

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当将这些值作为参数传递时，请确保它们是格式良好的XML文档。

While passing the values as a parameter, make sure that the documents are well formed XML documents.

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