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Type: boolean
Valid on any element that has a datasources attribute. When multiple datasources are used, one may override an assertion from another. This attribute, if true, which is the default, allows a datasource to negate an earlier assertion.
任何有 datasources 属性的元素有效。当有多个数据源时使用,可以覆盖另一个声明。这个属性,如果是真,这是默认属性,允许一个数据源取消更早的声明。 


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