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《中图法》在编列某些类目时,根据实际需要的不同,对于同一个内容(或问题),不只是列出一种类目,而是编列出两种或两种以上的类目。这样就产生了对同一内容根据不同标准进行多重列类,从不同方面列出多种相关的同位类。如关于“公路路面”这个内容,可以按路面的使用材料划分为“土路面”、“砾石路面”、“水泥混凝土路面”等等;也可以按路面的结构性质划分为“柔性路面”、“刚性路面”、“半刚性路面”等等;还可以按路面级别划分为“高级”、“次高级”、“中级”、“低级”等等路面。总之,虽然只是关于“公路路面”这一个内容,但却可以根据不同的标准去列出相关的三、四个同级类目。这样的多重标准列类,对从事实际分类标引人员来说往往产生一些困难。如一本论述《高级水泥混凝土公路路面》的书,是按路面级别归入“U416.23高级路面”呢?还是
For the same content (or question), the “CLC Law” lists some categories instead of just one category, but lists two or more categories according to actual needs . This results in multiple column classes based on different criteria for the same content, listing a variety of related classes of isometrics from different perspectives. For example, the content of “road pavement” can be divided into “soil pavement”, “gravel pavement” and “cement concrete pavement” according to the pavement use materials; or it can be classified into “flexible pavement”, “ Rigid pavement ”,“ semi-rigid pavement ”and so on; can also be divided according to the pavement level into“ senior ”,“ sub senior ”,“ intermediate ”,“ low ”and so on the road. In short, although it is only about “road pavement”, it is possible to list the relevant three or four sibling categories according to different standards. Such multiple standard categories often produce some difficulties for those who conduct actual classification and indexing work. For example, a book on High Cement Concrete Pavement is classified as “U416.23 Advanced Pavement” according to the level of pavement.