As you can see from Listing 5, parameter entities can refer to other parameter entities.
如清单5所示，参数实体可以引用其他参数实体。
The replacement text can include character entities, named entities, elements, etc. but not parameter entities.
替代文本可以包含字符实体、命名实体和元素等，但不包含参数实体。
You can emulate namespaces partially through parameter entities, but it is complex and not totally satisfactory.
可以通过参数实体部分模拟名称空间，但是非常复杂，而且不是完全令人满意。
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