Based on the model, an upper lower layer relational integrity is introduced.

在该模型下，引入了上下层关系完整性。

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Note that database relational integrity checks are disabled during the load process.

注意，数据库关系完整性检查在加载过程中禁用。

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It provides simple and efficient access to XML with the same levels of security, integrity, and resiliency taken for granted with relational data.

它提供了对XML的简单高效的访问，并为相关数据提供了相同的安全性、完整性和弹性。

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