Negative wildcard - exclude specific namespaces and names.

反向通配符(Negative Wildcard)——排除特定的命名空间与名字。

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With the help of the negative wildcard, you can now express the "one and only one userName and anything else" rule as in Listing 4.

借助否定通配符(negative wildcard)，现在可以表示“有且仅有一个userName，但可以有任意多个任何其他元素”规则，如清单4所示。

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