1.作为文献内容检索标识的标引词,必须是叙词表中的正式叙词,其书写形式必须同词表中叙词的书写形式完全一致。 非正式叙词不能作为标引词使用,而只能起引导到正式叙词的作用。 2.应当忠实地反映文献内容的真实主题,不得掺杂主观猜测。 3.应针对情报检索系统的专业性质,面向整个专业进行标引。 1. The index words used for the retrieval of the contents of the documents must be the official descriptors in the thesaurus which must be written exactly the same as the written forms of the descriptors in the glossary. Informal thesaurus can not be used as a guideline, but only serve as a guide to the role of the official thesaurus. 2. The real theme of the content of the document should be faithfully reflected, without subjective guesswork being mixed. 3. The professional nature of the intelligence retrieval system should be targeted to the entire profession.