Presentation on XPATH

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WHAT IS XPATH ?•XPath is normally called as XML Path

•XPath is the one of the way to locate elements on

webpage.

•XPath uses path expressions to select element in an

HTML document.

•XPath contains a library of standard functions

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XPath Syntax• XPath uses path expressions to select nodes in an XML document. The node is selected by following steps.

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Expression Descriptionnodename Selects all nodes with the name "nodename"

/ Selects from the root node

// Selects nodes in the document from the current node that match the selection no matter where they are

. Selects the current node

.. Selects the parent of the current node

@ Selects attributes

Xpath Ways• Xpath can be created in two ways:

• Absolute XpathAbsolute Xpath begins with a root path and is prefixed with a “/”.

• Relative XpathRelative Xpath begins from the current location and is prefixed

with a “//”.

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XPath Axes An axis defines a node-set relative to the current node.

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•ancestor•ancestor-or-self•attribute• child•descendant•descendant-or-self• following• following-sibling

•namespace•parent•preceding•preceding-sibling• self

Selecting Unknown Nodes• XPath wildcards can be used to select unknown XML nodes.

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Wildcard Description

* Matches any element node@* Matches any attribute nodenode() Matches any node of any kind

XPath functionsXPath contains a number of functions on node sets, numbers, and strings;

here are a few of them:

• Contains: contains(arg1, arg2) tests if arg1 contains arg2Example://img[contains(@src,’Profile’)]

• starts-with: starts-with(arg1, arg2) tests if arg1 starts with arg2

Example: //*[starts-with(name(), 'sec']

• ends-with: ends-with(arg1, arg2) tests if arg1 ends with arg2

Example: //*[ends-with(name(), ‘details']

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