计算机编目形成的机读书目数据所提供的检索区(即标目)越来越多,这些标目(典型的有名称、题名和主题)所代表的内容即标目对象,由于种种原因会发生变化,或同一文字形式的标目实际上代表了不同的含义,或同一概念又有不同形式的标目来表达。为了使用户在检索书目记录过程中能查全、查准所需的记录,有必要把这些标目之间的关系建立起来,而规范控制的功能就在于此。 There are an increasing number of search areas (ie, headings) provided by computer-generated machine readable bibliographic data, and the contents of these headings (typically names, titles and topics), ie, headings, occur for a variety of reasons Variables, or headings of the same text, actually represent different meanings or have the same concept in different forms of headings. In order to enable users to search the bibliographic records in the search process, check the required records, it is necessary to establish the relationship between these headings, and regulate the function of control lies here.