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。
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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