实际的应用程序可能会使用符号标识符来定位适当的内容处理程序并使用实体的系统标识符作为其输入。
A real-world application might use the notation identifier to locate the appropriate content processor and use the entity's system identifier as its input.
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.
从图形符号功能和特点出发，对其在产品包装上的使用效果及其影响因素进行了系统分析，论述了图形标识符号使用的误区，提出了图形符号设计新方法。
The utilization effects of pictograms in package product were analyzed systematically based on their feature and function. A kind of new graphic symbol design method was put forward.
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