参数实体只用于DTD和文档的内部子集中。
Parameter entities are only available inside the DTD and the internal subset of your document.
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。
This DTD can be the internal subset of an XML document, if you wish, or it can be an external file.
所有其他非字符实体类型都被忽略,而且不进行检验,即使对于内部子集中的声明。
All other non-character entity types are ignored, and no validation is performed, even for declarations within the internal subset.
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