The path /book/price identifies all price elements that are immediate children of the element "book."
路径 /book/price识别了所有 price元素，它们是元素 “book”的直接子元素。
The fourth predicate $i/*/price = 29 looks for price elements under any root element, not just "book."
第四个谓词 $i/*/price =29 将查找任何根元素下的 price元素，而不仅仅是在 “book” 元素下的。
Not only "price" elements can fulfill this predicate.
不仅是 “price”元素可以满足该谓词。
These can be one and the same element or two different "price" elements.
这些子元素可以是同一个 “price” 元素或两个不同的 “price”元素。
For example, the next two queries may return the same result, but only if all "price" elements encountered during the query execution have a single text node and no other child nodes.
例如，下面两个查询可能返回相同的结果，但条件是仅当查询执行过程中所遇到的全部“price”元素都拥有单个文本节点且没有其他子节点。
The index does not contain "price" elements at a deeper level, which may exist in the table and are potential matches for the predicate path $i//price.
索引没有包含更深层次的 “price”元素，表中可能存在该元素且可能与谓词路径 $i//price 相匹配。
The index does not contain "price" elements at a deeper level, which may exist in the table and are potential matches for the predicate path $i//price.
索引没有包含更深层次的 “price”元素，表中可能存在该元素且可能与谓词路径 $i//price 相匹配。
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