A user can enforce validation on an XML column using check constraints.
用户可以使用检查约束来加强对xml列的验证。
Constraint checks and schema validation are built into the XML model.
xml模型内置了约束检查和模式检验功能。
It is written in the XML Schema definition language to describe the structure and constrain the content of XML documents.
它是使用XML模式定义语言编写的，描述了XML文档的内容结构和约束。
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