Notations are part of the full regalia of DTDs, and I've included within the file a DTD internal subset that's required to declare the entity for the external file.
表示法是DTD完整标记的一部分，我们在这个文件中包含了一个DTD内部子集，它用来为外部文件声明实体。
Notations allow the XML document to pass notifying information to external applications.
标记法允许XML文件将通知资讯传给外部应用程序。
Notations allow the XML document to pass notifying information to external applications.
标记法允许XML文件将通知资讯传给外部应用程序。
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