The unit information comes from the relational table unit.

单位信息来自关系型表unit。

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For example, a non-XML data source can be a relational table.

例如，一个非xml数据源可以是一个关系表。

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Additionally, each column from within a relational table is represented by an element.

此外，关系表内的每列都由一个元素表示。

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Additionally, each column from within a relational table is represented by an element.

此外，关系表内的每列都由一个元素表示。

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