Table 1 shows the objects used to define each screen type.

表1显示了用于定义每种屏幕类型的对象。

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For example, if the music product type is declared as a hard type, then there will be a musicproduct database table, and you can define the artist name and release date elements as columns.

例如，如果music product类型被声明为硬类型，那么将创建一个musicproduct数据库表，并且可以定义artist name和release date元素作为列。

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Reserved extended table field: Pre-define a fixed number of additional data columns in each table with a generic column type (e.g. varchar).

保留的扩展表字段：在每个表中预先定义固定数量的额外数据列，这些列采用通用列类型（比如 varchar）。

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