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。
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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