Index idx4 declares the namespace and prefix explicitly to match the document.

索引idx4显式地声明了名称空间和前缀以匹配文档。

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Note too that the namespace prefix mappings (xf:) in the XPath don't have to match those used in the target document (x:).

还要注意的是，XPath中的名称空间前缀映射(xf：)不一定与目标文档使用的相同(x：)。

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The query processor of XGrind can handle only exact-match and prefix-match queries on compressed values and partial-match and range queries on decompressed values.

XGrind的查询处理器只能处理压缩值的精确匹配和前缀匹配查询，还可以处理对解压值的部分匹配和范围查询。

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