Parameter entities - Listing 5.

参数实体—清单5。

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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。

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Parameter entities are only available inside the DTD and the internal subset of your document.

参数实体只用于DTD和文档的内部子集中。

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