下面三行定义与根元素关联的各种名称空间和相应的前缀。
The next three lines define the various namespaces associated with this element and their respective prefixes.
根元素CAM定义了整个模板本身使用的名称空间以及CAM的层次和版本。
The root element, CAM, defines the namespace used throughout the template itself as well as the level and version of CAM.
但是有一点它没有定义，就是根元素，这留给了宿主语言去解决。
One thing it doesn't define, however, is a root element — that is left to a host language to address.
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