Variables: variables are used with compound steps and define XPath variables for use within a compound step sub-pipeline.
变量：变量和复合步骤一起使用，定义在复合步骤子管道中使用的Xpath变量。
Variables: variables are used with compound steps and define XPath variables for use within a compound step sub-pipeline.
变量：变量和复合步骤一起使用，定义在复合步骤子管道中使用的Xpath变量。
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