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。
This DTD can be the internal subset of an XML document, if you wish, or it can be an external file.
这个DTD可能是XML文档的内部子集，如果愿意，它也可以是外部文件。
So to summarize, the internal subset of a DTD is checked for internal general entities, which are correctly processed.
总的来说，Firefox 对 DTD 的内部子集进行检查来识别内部一般实体，从而正确地处理它们。
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