该系统提供了表示层对数据文件抽象语法表示的支持及数据语法的转换，从而达到了数据文件共享的目的。

This system provides a support of presentation layer to the data file abstract syntax notation and the data grammatical conversion in order to achieve one's object of the sharing of data files.

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每个属性类型都以属性值的形式定义被保存的数据的语法。

Every attribute type defines the syntax of the data to be stored as the attribute value.

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域是类或类型并表示数据的规则、语法及语义(例如，它必需是整型、浮点型、图片类型等等)。

A domain is a class or type and indicates the rules, syntax, and semantics for a piece of data (for example, it must be an integer, float, conform to a picture, and so on).

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