Resources

Only a fraction of what XPath offers has been covered here, mainly basic concepts and areas that are most likely to be applicable when using XPath to extract data from retrieved markup documents. Other functions and operators and more advanced concepts are detailed further in the resources cited at the end of the chapter. Review of those resources is highly recommended for more extensive and complex data extraction applications.

• DOM documentation in the PHP manual: http://php.net/dom
• An excellent overview of XML and XPath: http://schlitt.info/opensource/blog/0704_xpath.html
• More information on XML: http://en.wikibooks.org/wiki/XML:_Managing_Data_Exchange
• DOM Level 3 Core standard: http://www.w3.org/TR/DOM-Level-3-Core
• DOM Level 3XPath standard: http://www.w3.org/TR/DOM-Level-3-XPath