XML DOM node

In the DOM, every component in an XML document is a node.

DOM Nodes

According to the DOM, every component in an XML document is anode。

DOM specifies this:

  • The entire document is a document node
  • Every XML element is an element node.
  • Text contained in an XML element is a text node.
  • Every XML attribute is an attribute node.
  • Annotations are annotation nodes.

DOM Examples

Please look at the following XML file (books.xml）：

books.xml file code:

<?xml version="1.0" encoding="UTF-8"?> <bookstore> <book category="cooking"> <title lang="en">Everyday Italian</title> <author>Giada De Laurentiis</author> <year>2005</year> <price>30.00</price> </book> <book category="children"> <title lang="en">Harry Potter</title> <author>J K. Rowling</author> <year>2005</year> <price>29.99</price> </book> <book category="web"> <title lang="en">XQuery Kick Start</title> <author>James McGovern</author> <author>Per Bothner</author> <author>Kurt Cagle</author> <author>James Linn</author> <author>Vaidyanathan Nagarajan</author> <year>2003</year> <price>49.99</price> </book> <book category="web" cover="paperback"> <title lang="en">Learning XML</title> <author>Erik T. Ray</author> <year>2003</year> <price>39.95</price> </book> </bookstore>

In the XML above, the root node is <bookstore>. All other nodes in the document are contained in <bookstore>.

The root node <bookstore> has four <book> nodes.

The first <book> node has four child nodes: <title>, <author>, <year>, and <price>. Each of these nodes contains a text node: "Everyday Italian", "Giada De Laurentiis", "2005", and "30.00".

Text is always stored in text nodes

A common error in DOM processing is to think that element nodes contain text.

However, the text of an element node is stored in a text node.

In this instance:<year>2005</year>The element node <year> has a text node with a value of "2005".

"2005" is notThe value of the <year> element!


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