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2007-06-05 17:24
XPath Óï·¨
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XPath Nodes(½Úµã) XPath Axes
XPath uses path expressions to select nodes or node-sets in an XML document. The node is selected by following a path or steps.
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The XML Example Document
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We will use the following XML document in the examples below.
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<?xml version="1.0" encoding="ISO-8859-1"?>
<bookstore>
<book>
   <title lang="eng">Harry Potter</title>
   <price>29.99</price>
</book>
<book>
   <title lang="eng">Learning XML</title>
   <price>39.95</price>
</book>
</bookstore>
Selecting Nodes
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XPath uses path expressions to select nodes in an XML document. The node is selected by following a path or steps. The most useful path expressions are listed below:
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Expression
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Description
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nodename
Selects all child nodes of the node
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/
Selects from the root node
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//
Selects nodes in the document from the current node that match the selection no matter where they are
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.
Selects the current node
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..
Selects the parent of the current node
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@
Selects attributes
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Examples
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In the table below we have listed some path expressions and the result of the expressions:
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Path Expression
±í´ïʽ
Result
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bookstore
Selects all the child nodes of the bookstore element
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/bookstore
Selects the root element bookstore
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