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26 Cards in this Set
- Front
- Back
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Selecting Nodes
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The node is selected by following a path or steps.
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Path expression: nodename
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Selects all child nodes of the named node
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Path expression: /
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Selects from the root node
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Path expression: //
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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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Path expression: .
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Selects the current node
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Path expression: ..
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Selects the parent of the current node
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Path expression: @
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Selects attributes
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Predicates
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Predicates are used to find a specific node or a node that contains a specific value. Predicates are always embedded in square brackets.
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Sample Path Expression: /bookstore/book[1]
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RESULT: Selects the first book element that is the child of the bookstore element.
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SamplePath Expression: /bookstore/book[last()]
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RESULT: Selects the last book element that is the child of the bookstore element
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/bookstore/book[last()-1]
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RESULT: Selects the last but one book element that is the child of the bookstore element
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/bookstore/book[position()<3]
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RESULT: Selects the first two book elements that are children of the bookstore element
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//title[@lang]
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RESULT: Selects all the title elements that have an attribute named lang
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Sample Path Expression: //title[@lang='eng']
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RESULT: Selects all the title elements that have an attribute named lang with a value of 'eng'
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Sample Path Expression: /bookstore/book[price>35.00]
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RESULT: Selects all the book elements of the bookstore element that have a price element with a value greater than 35.00
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Sample Path Expression: /bookstore/book[price>35.00]/title
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RESULT: Selects all the title elements of the book elements of the bookstore element that have a price element with a value greater than 35.00
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Wildcard: *
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Matches any element node
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Wildcard: @*
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Matches any attribute node
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Wildcard: node()
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Matches any node of any kind
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/bookstore/*
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RESULT: Selects all the child nodes of the bookstore element
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//*
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RESULT: Selects all elements in the document
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//title[@*]
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RESULT: Selects all title elements which have any attribute
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Selecting Several Paths
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By using the | operator in an XPath expression you can select several paths.
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//book/title | //book/price
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RESULT: Selects all the title AND price elements of all book elements
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//title | //price
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RESULT: Selects all the title AND price elements in the document
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//book/title | //book/price
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RESULT: Selects all the title elements of the book element of the bookstore element AND all the price elements in the document
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