Detailed introduction to XPath technology

Basic overview of XPath technology XPath is the XML path language. It is a language used to determine the location of a certain part of an XML (a subset of the Standard General Markup Language) document. XPath is based on the tree structure of XML and provides the ability to find nodes in the data structure tree. The original intention of XPath was to serve as a universal syntax model between XPointer and XSLT. But XPath was quickly adopted by developers as a small query language. PS: It cooperates with DOM4J parsing technology to make up for the shortcoming of DOM4J that it cannot fetch elements across layers. The jaxen-1.1-beta-6.jar package needs to be introduced. Principle of XPath XPath is like a SQL query statement, which can query the DOM tree and obtain the corresponding results. XPath case XML9.xml

1. XPath Technology

##Introduction: XPath is the XML path language. It is a language used to determine the location of a certain part of the XML (a subset of the Standard Universal Markup Language) document. XPath is based on the tree structure of XML and provides. The ability to find nodes in a data structure tree. XPath was originally proposed as a general syntax model between XPointer and XSLT, but XPath was quickly adopted by developers as a small query language.

2. xpath technology parsing xml and case simulation user login effect

##Introduction: Problem: When using dom4j to query nodes with deep hierarchies (labels, attributes, text), it is troublesome!

##3. ##PHP The road to self-study-----Basic introduction to XML programming (Xpath technology, simpleXml technology)_PHP tutorial

Introduction: The road to PHP self-study---- - Basic introduction to XML programming (Xpath technology, simpleXml technology). The core idea of ​​XPath design is to quickly and briefly locate the node you want to find through xpath. The main purpose is to describe the position of the node relative to other nodes and obtain all matching conditions.

4. PHP self-study road-----Basic introduction to XML programming (Xpath technology, simpleXml technology)

Introduction: PHP self-study road-----Basic introduction to XML programming (Xpath technology, simpleXml technology). The core idea of ​​XPath design can quickly and briefly locate the node you want to find through xpath. The main purpose is to describe. The position of a node relative to other nodes can be obtained by all matching conditions

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