子模式仅仅是数据库中与一个特殊用户的需求相关的一部分的描述。
A subschema is a description of only that portion of the database pertinent to a particular user's needs.
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。
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.
IDMS用数据字典控制系统产品的存取，用子模式控制数据的存取，使数据库不被非法用户使用。
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.
IDMS用数据字典控制系统产品的存取，用子模式控制数据的存取，使数据库不被非法用户使用。
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.
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