One example of such an element and attribute pairing in an XML schema is the tax element with a currency attribute.
XML模式中有这样一个元素和属性配对的示例：带有currency属性的tax元素。
Meanwhile, according to the theory of set pairing, concepts of brittle link entropy and basic element are defined.
根据集对分析的理论，定义了子系统间的脆性联系熵、脆性基元等概念。
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