符号标识符的目的是让XML处理或格式系统更容易找到helper应用程序，该应用程序将处理与符号相关的文件的类型。
Notation identifiers are designed to make it easy for an XML processing or formatting system to locate a helper application that will handle the types of files associated with that notation.
符号标识符的目的是让XML处理或格式系统更容易找到helper应用程序，该应用程序将处理与符号相关的文件的类型。
Notation identifiers are designed to make it easy for an XML processing or formatting system to locate a helper application that will handle the types of files associated with that notation.
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