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《中图法》主表号码基本遵循层累制编号原则。通过对概念的层层逻辑划分和等级排列建立类目体系、号码系统伴随着类目体系的深入展开,一级一级地由号码末端向纵深扩展,形成类号与类目一一对应,类号位数与类目级别——对应的关系,例如: P1天文学 12天体测量学 123照相天体测量学 1天体照相复分表的编号规则同样按层累制划分,若干主表下级一组类目的号码与复分细目类号没有区别:
“Chart Law” main table numbers basically follow the principle of layer numbering. Through the classification and hierarchical arrangement of concepts, the category system is established. The numbering system expands with the category system. The numbering system expands from the end of the number to the depth one by one, forming a one-to-one correspondence between category numbers and categories. For example: P1 Astronomy 12 Astrometry 123 Photogrammetry Calculus 1 Numbering rules for celestial photometric duplicates are also divided according to layers, with a set of categories No difference between the number and the number of sub-sub-categories: