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XPath表达式
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.(单点)
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符号“.”用于引用当前节点自身。例如,“.”表示选择当前的节点,而“.//item”表示作为当前节点的所有item子元素
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..(双点)
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符号“..”表示当前节点的父亲点。
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[](方括号)
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表示有序序列中的特定元素。比如,list/itme[2]代表list节点的第二个item子节点。
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@
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符号“@”表示节点属性。例如,“@price”表示名为price的属性。
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/(左斜杠)
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表示当前文档的节点。例如,“/A/C/D”表示节点“A”的子节点“C”的子节点“D”。
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//(双左斜杠)
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表示当前文档所有的节点。例如,“//E”表示所有E元素;“//C/E”表示所有父节点为C的E元素。
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*(星号)
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表示路径的通配符。例如,“A/B/C/*”表示A元素->B元素->C元素下的所有子元素;“/*/*/D”表示上面有两级节点的D元素;“//*”表示所有的元素。
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\(坚杠)
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表示逻辑或,用于获取节点并集。例如,“//B\//C”表示所有B元素和C元素。
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表10-8 XPath表达式示示例例表
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表达式 说明
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author 当前节点位置的所有<author>元素
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/bookstore 文档中的所有<bookstore>元素
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//author 文档中所有<author>元素
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book[/bookstore/@specialty=@style] 所有<book>元素,其style属性值与根节点下bookstore节点的specialty属性值相等。
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@style 当前节点的style属性
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book[@style] book节点的style属性
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author[1] 当年节点的第一个<author>元素
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my:book 名称空间名为my的元素<book>
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book[excerpt] 所有<book>元素,至少包含一个<excerpt>子元素
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author[.="Matthew Boj"] 所有值为“Matthew Boj”的<author>元素
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