This is primarily to avoid name clashes: If two classes have the same attribute and are mapped to global names, they may conflict.
这样做主要是为了避免名称冲突:如果两个类具有相同的属性,映射为全局名可能会造成冲突。
It is used to ensure that names used by one DTD don't conflict with user-defined tags or tags defined in other DTDs.
它用来确保一个DTD使用的名称不与用户定义的标记或其它DTD中定义的标记冲突。
If there is a conflict with existing group names, you will be prompted to change the group names.
如果和已有的组名冲突,就会提示修改组名。
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