2009 08 22 Froscon Xpath

XPath?  An XML Query Language  Often considered the SQL for XML  XML seen as a directory structure  Allows for easy and flexible finding of nodes  Supports very complex queries with yet an easy to read syntax  Version 2 just recently standardized  LibXML 2 so far only supports version 1  Bug Rob Richards to add version 2 ;-P

XPath?  XSL(T)  XML Stylesheet Language  Used for (T)ransformations of XML dialects  Available through libXSL & ext/xsl in php  DOM Standard  DOMXPath Object within PHP (ext/dom)  Native API in Gecko based browers  Selenium Testing  Specify elements for the tests

XPath and DOM  Two ways to query  A query returns a Nodelist  Nodelists contain only references to DomNodes  A query can also return a direct value  Namespace aware  Must use prefixes – all the time  Do not mix with DOM Level 1 Methods

XPath and PHP  DOM  DOMXPath Object  Used in conjunction with DOMDocument  Nodelists contain references to DOMNodes  SimpleXML  Direct query possible, no seperate Objects  Array of references to SimpleXML-Objects

XPath – The basic syntax  Level Seperator: /  Every Level: //  Wildcard: *  Attribute: @  Wildcard-Attribute: @*  Filter or Requirement: [ ... ]

XPath functions – a selection  starts-with()  contains()  position()  last()  string-length()  substring()  not()  ...

XPath and XSL(T)  Some additional functions  document()  format-number()  current()  ...

XPath, XSL and PHP  PHP Callbacks possible  php:function(....)  EXSLT-Functions  Date & Time handling  Custom functions  ...

XPath Samples  //node  /root/element  /root/element[1]  Xpath starts counting with 1 (except for IE 6)  @id  /root//node/@name  /root/element[@name = 'php']/@*  ./some/*[@class='tek']/@id  //php:node/demo:element[test]

XPath in the real world. Aka let's play Live Demo ;-)

Selenium  GUI Testing framework  For webbased content and applications  Selenium IDE  Firefox Extension for easy test writing  Selenium RC (remote control)  Server process to automate testing  Controls Gecko, Webkit and even IE  Supported by PHPUnit!

Selenium IDE Live Demo ;-)

2009 08 22 Froscon Xpath

by Arne Blankerts on Aug 22, 2009

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