It updates the XML document to match the cid attribute with the value of a cid relation column.

它更新XML文档以使用cid关系列的值匹配cid属性。

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Link relation extensions involve the creation of a new link element rel attribute value that identifies a new type of link relation.

链接关系扩展包括创建新的link元素和rel属性值，标识新的链接关系类型。

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In normalization theory of relation database, finding candidate key and primary attribute is always a difficult problem.

在关系数据库规范化理论中，求解后选关键字和主属性一直是一个棘手的问题。

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