XML名称空间通过在标签名前增加全局标识符将本地名转化成全局名。
XML namespaces turn local names into global ones by appending a global identifier to the tag name.
换句话说，标签名不是全局标识符。
In other words, the name of a tag is not a global identifier.
标签名不是标识符，同样，前缀也不是标识符。两个不同应用程序使用同一前缀的风险很大。
A prefix is not an identifier for the same reason that a tag name cannot be an identifier: the risk of two different applications using the same prefix is high.
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