(一) 标引深度标引深度是衡量文献所论及的主题要素在标引作业中被确认和转换成检索词所达到的程度。具体地说,标引深度是指检索系统赋予某文献的检索标识的数量。标引深度包括主题标引深度和非主题标引深度(如外表特征等)两个方面。习惯上 (A) Indexing depth The indexing depth is a measure of the extent to which the subject matter covered by the literature has been identified and translated into the search terms in the indexing exercise. Specifically, the indexing depth refers to the number of retrieval identifiers given to a document by the retrieval system. The indexing depth includes two aspects: the depth of topic indexing and the depth of non-topic indexing (such as appearance features). Habits