可是不易处理的问题是，应用软件期望这个数据结构用 COBOL 语言来定义。
The tricky issue, though, is the fact that the PhoneBook application expects the data structures to be defined in COBOL language.
同时，为使高层应用易于对模型进行有效性和一致性检查，采用超图数据结构形式化地定义了上述模型的概念模型。
Besides, in order to facilitate applications to check affectivity and consistency of this model, a formal concept model based on hyper-graph data structure is proposed.
应用模型是一种基于对象的描述模型，它将数据视图作为一种对象来定义和使用，从而使其能够描述比较复杂的数据结构。
Application model is a kind of description model based on objects, it USES the concept of object to define data views, and can describe complex data structures.
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