Tutorial for beginners of XPath: XPath nodes

In XPath, there are seven types of nodes: elements, attributes, text, namespaces, processing commands, comments, and document nodes (or become root nodes ). In XPath, Node has seven types of nodes: elements, attributes, and text.

In XPath, there are seven types of nodes: elements, attributes, text, namespaces, processing commands, comments, and document nodes (or become root nodes ).

XPath term Node)

There are seven types of nodes in XPath: elements, attributes, text, namespaces, processing commands, comments, and document (root) nodes. XML documents are viewed as node trees. The root of a tree is called a document node or a root node.

See the following XML document:

 
 
    
   Harry Potter  J K. Rowling   
   
    2005
     
   
    29.99
   
  
 

Node example in the XML document above:

 
  
(Document Node) j k. Rowling(Element node) lang = 'en' (attribute node)
 

Base value (or Atomic value, Atomic value)

The base value is a node with no parent or child.

Example of basic value:

J K. Rowling'en'

Item)

A project is a base value or node.

Parent node)

Each element and attribute has a parent.

In the following example, the book element is the parent of the title, author, year, and price elements:

   
  Harry Potter  J K. Rowling  
  
   2005
    
  
   29.99
  
 

Child)

There can be zero, one, or more sub-nodes.

In the following example, the title, author, year, and price elements are child of the book element:

   
  Harry Potter  J K. Rowling  
  
   2005
    
  
   29.99
  
 

Sibling)

Having the same parent node

In the following example, the title, author, year, and price elements are all siblings:

   
  Harry Potter  J K. Rowling  
  
   2005
    
  
   29.99
  
 

Advanced (Ancestor)

The parent and parent of a node.

In the following example, the first generation of the title element is the book element and the bookstore element:

 
    
   Harry Potter  J K. Rowling  
   
    2005
     
   
    29.99
   
  
 

Descendant (Descendant)

The child of a node, the child of the child, and so on.

In the following example, the future generations of bookstore are book, title, author, year, and price:

 
    
   Harry Potter  J K. Rowling  
   
    2005
     
   
    29.99