如果您有一个域名，那就拥有由您控制名称的一片天地，而且这应用于您的XML名称空间，也应用于您的服务器。

If you have a domain name, you have a piece of the world where you control the names, and this applies to your XML namespaces as well as your servers.

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应用名称空间仅意味着：您从自己控制的域名中选取了一个URI，并将该URI定义成特定XM l标记集的名称空间uri。

Applying a namespace simply means that you pick a URI under a domain name that you control, and define that URI to be the namespace URI for a particular set of XML tags.

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选取目前节点中，所有具有指定区域名称和命名空间uri的子代节点。

Selects all the descendant nodes of the current node with the local name and namespace URI specified.

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