一、引言 我们知道标引工作就是给每篇文献赋于一组检索语言的单元词(例如:关键词、叙词等)的过程,以便在情报检索系统中形成他们的查询描述。 在情报处理过程中,标引属于一项相当精确的工作,这也是它之所以难以用算法来表达的原因。其查询描述不仅要保留文献的中心内容,而且, I. INTRODUCTION We know that indexing is the process of assigning each document to a set of unit words (eg, key words, descriptors, etc.) of the retrieval language in order to form their query description in the intelligence retrieval system. In intelligence processing, indexing is a fairly accurate job, which is why it is difficult to express it in algorithms. The query description not only to keep the center of the literature, but also,