Using a different namespace for only the new elements is rarely a sensible option.

仅仅为新元素使用不同的名称空间几乎肯定是不合理的选择。

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The draw-back to using a unique namespace for headers is that a JAX-RPC handler might not recognize the header at all if it is not searching for that exact name.

使用消息头的唯一命名空间的缺点是如果不查找精确的名称，那么 JAX-RPC 处理程序就完全不能识别消息头。

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Often, however, a single URI is not enough; what's really needed is a way to describe a namespace using multiple resources, including DTDs, XML Schemas, XSL stylesheets and software documents.

但通常仅仅一个URI还不够，实际上我们需要一种办法使用多种资源来描述名称空间，包括DTD、XML模式、xsl样式表和软件文档。

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