相似的，像ISBN、OCLC控制号、LCCN以及图书馆条码号这些“识别符”都是重要的字符串，它们都是识别的指示符，但是作用的大小各有不同。
Similarly, "identifiers" such as ISBN, OCLC number, LCCN, and library barcode number are used as key strings but are only identity indicators with varying strengths.
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.
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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