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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The Malibu home that just transferred hands from Semel to Ellison sits on a three-quarter-acre lot includes three structures, creating a compound just steps from the sand.

FORBES: Oracle CEO Larry Ellison Pays $37M for the Beachfront Malibu Estate of Former Yahoo! CEO Terry Semel