XML DOM Nodes
In the DOM, everything in an XML document is a node.
DOM Nodes
According to the DOM, everything in an XML document is a node.
The DOM says:
- The
entire document is a document node
- Every XML element is an element node
- The text in the XML elements are text
nodes
- Every attribute is an attribute node
- Comments are comment nodes
DOM Example
Look at the following XML file (books.xml):
<?xml version="1.0" encoding="ISO-8859-1"?>
<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>
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The root node in the XML above is named <bookstore>. All other nodes in the
document
are contained within <bookstore>.
The root node <bookstore> holds four <book> nodes.
The first <book> node holds four nodes: <title>, <author>, <year>, and
<price>, which contains one text node each, "Everyday Italian", "Giada
De Laurentiis", "2005", and
"30.00".
Text is Always Stored in Text Nodes
A common error in DOM processing is
to expect an element node to contain text.
However, the text of an element node is stored in a text node.
In this example: <year>2005</year>, the element node
<year>, holds a
text node with the value "2005".
"2005" is not the value of the <year> element!
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