Select the Output element from the palette and place it below the price element.

从调色板中选择Output元素，并将其放在price 元素的下面。

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If you know that a book has at most one price element, you can write the query using XQuery value comparisons, which force the comparison operands to be singletons.

如果知道某个book至多有一个price元素，则可以使用XQuery的值比较来编写查询，这迫使进行比较的操作数是单个数。

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For example, you could define a Price element that is always a floating-point number or a PersonName element that has FirstName and LastName sub-elements that are both strings.

例如，可以定义始终是浮点数的Price元素或具有字符串子元素FirstName和LastName的PersonName元素。

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For example, you could define a Price element that is always a floating-point number or a PersonName element that has FirstName and LastName sub-elements that are both strings.

例如，可以定义始终是浮点数的Price元素或具有字符串子元素FirstName和LastName的PersonName元素。

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