For these actions, the data types directly correspond to the field they represent.

对于这些动作，数据类型直接对应它们代表的字段。

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Relational databases that store XML data usually use Binary Large Object (BLOB) field types to store XML.

存储XML数据的关系数据库通常使用大型二进制对象(BLOB)字段类型存储XML。

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The field types, options, default values, field orders, and so on are defined by the user to attach a custom form of data elements to the document.

字段类型、选项、默认值和字段顺序等都由用户定义，从而为文档添加定制的数据元素。

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