元数据字典及其实现

本文提出了元数据字典，给出了它的模型和实现方法，元ＤＤ用于存储ＤＤ结构信息和完整性约束信息，使这些信息能从ＤＤ管理程序源代码中分离出来，因而就能够实现一个通用ＤＤ管理程序；不同软件系统可以采用结构不同的ＤＤ，这些ＤＤ的结构由元ＤＤ管理程序生成，所有ＤＤ均由一个通用ＤＤ管理程序来管理.

META-DATA DICTIONARY AND ITS IMPLEMENTATION

Meta-data-dictionary(MDD) is proposed,and its model and computer implementation are given. The information on the structure and integrity of DD's can be separated from the source code of their managers and stored in the MDD,thus a generalized DD manager can be implemented. With MDD,different DD frames,which are generated by the MDD manager,can be adopted to develop different software systems,and all DD's are managed by the generalized DD manager.