在该表的每一行中，都有一个路径位置表达式和一个相关的指定列。
In this table for each row, there is both a path location expression and an associated named column.
在items中，路径位置表达式使用星号作为通配符nametest匹配所有子元素below - item。
Within items, the path location expression then USES an asterisk to perform a wildcard NameTest to match on all child elements below - items.
要完成整个路径位置表达式的求值，所有元素都必须步进，并匹配第一次出现的子元素named - USPrice。
To complete the evaluation of the entire path location expression, each of these elements will be stepped into and the first occurrence of an expected child element named - USPrice matched on.
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