In DB2, XML document validation is done on a per document basis, not at column level.

在 DB2 中，XML 文档验证是以每个文档为单位进行验证的，而不是以列为单位进行验证。

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XML document validation -- You can perform XML value validation for XML documents against a registered XML schema.

XML 文档验证 —— 您可以在已注册的 XML 模式上对 XML 文档执行 XML 值验证。

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Actually, the element is only really known to occur in the XML document; validation of the XML document against the DTD is a job that needs to be handled outside of these modules.

实际上，我们只是知道该元素出现在XML文档中；对照DTD确认XML文档是需要在这些模块外部处理的作业。

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