C、类目之间的关系从属关系 某一个类与其直接细分出来小类之间的关系。这个类目称上位类,细分出来的小类称下位类。一系列从属关系的类目,总称为一个类系。图书分类表的上下位类是用不同字体和缩格的方式表示的。下位类一定能包括它所属的各级下位类。 C, the relationship between categories Subordination between a class and its direct subdivision of the relationship between subcategories. This category called supernatural class, subclassified subordinate class. A series of subordinate categories, collectively referred to as a category. The upper and lower class of book classification table is expressed in different fonts and reduced format. The next class must be able to include the subordinate classes at all levels to which it belongs.