The abstract information of entire software code is stored in a program database that is the conceptual scheme of the entire software, whereas the reuse component is a subscheme.
整个软件源代码的抽象信息存入程序数据库中，相当于软件的概念模式，重用构件相当于子模式。
2
Under IDMS, the access to system products is controled by means of a data dictionary, and data access is controled by subscheme, so as to protect IDMS data base accessed from unauthorized users.