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目前,图书情报界对文献的主题标引主要采用主题词和关键词。两种标引词的主要区别是:主题词是受控词,无论文献标引还是用户检索的词汇都是由词表控制,而词表则是经过规范化的,动态的词汇表,其中包括分、属、参、用、代等含有特定学科领域,在语义和类属关系上相关的许多实词组成的,是一种规范化的“系统语言”(索引语言)的工具。关键词是一种自然语言,没有词表控制,可直接从文献题目、正文或文摘中直接抽取具有实际意义的词汇进行标引和检索。例如:有论述中国法律制度的文章,
At present, the subject index of the library information mainly uses keywords and keywords. The main difference between the two indexing words is: the keyword is a controlled word, regardless of the literature index or user-retrieved vocabulary is controlled by the vocabulary, and vocabulary is a standardized, dynamic vocabulary, including points It is a standardized “system language” (indexing language) tool that consists of a number of real words that are related to semantic and generic relationships, including genres, references, uses, and generations. Keyword is a kind of natural language, without vocabularies control. It can draw and retrieve the meaningful words directly from the literature title, body or abstract. For example: there is an article dealing with the Chinese legal system,