文章通过对主要字段指示符的取值分析，指出了指示符的重要作用以及文献著录中应注意的问题。

By analyzing the value of primary field indicator, this article points out important function of indicator and problems in document bibliography.

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可以设置用户首次向主要的内容字段输入数据时的事件处理程序，如图2所示。

You can set an event handler for the first time the user enters data into the main content field. Figure 2 illustrates.

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该头部之后是MTI(长度为4个字节)，然后是主位图(8个字节长)，最后是包含数据字段的最主要的消息部分。

The MTI (4 bytes long) follows this header, and then a Primary Bitmap (8 bytes long), and then finally the core part of the message containing the Data Fields.

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