Leave the default value for this exercise, but, in a real-world transformation you can replace it with an XPath expression.
对于这里的练习，您可以保持默认值不变，但是，在真实的转换操作中，您就可以使用一个XPath表达式来替换它。
As is known to everyone, the constitution of price is the monetary expression of the value in real estate.
众所周知，房地产价格的构成是房地产价值构成的货币表现。
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