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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en_US" lang="en_US">
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<!-- xml-processing.qdoc -->
  <title>Qt 4.8: Working with the DOM Tree</title>
  <link rel="stylesheet" type="text/css" href="style/offline.css" />
</head>
<body>
<div class="header" id="qtdocheader">
  <div class="content"> 
    <a href="index.html" class="qtref"><span>Qt Reference Documentation</span></a>
  </div>
  <div class="breadcrumb toolblock">
    <ul>
      <li class="first"><a href="index.html">Home</a></li>
      <!--  Breadcrumbs go here -->
<li>Working with the DOM Tree</li>
    </ul>
  </div>
</div>
<div class="content mainContent">
  <link rel="prev" href="xml-sax.html" />
  <link rel="next" href="xmlprocessing.html" />
<p class="naviNextPrevious headerNavi">
<a class="prevPage" href="xml-sax.html">The SAX interface</a>
<a class="nextPage" href="xmlprocessing.html">XQuery/XPath and XML Schema</a>
</p><p/>
<div class="toc">
<h3><a name="toc">Contents</a></h3>
<ul>
<li class="level1"><a href="#introduction-to-dom">Introduction to DOM</a></li>
</ul>
</div>
<h1 class="title">Working with the DOM Tree</h1>
<span class="subtitle"></span>
<!-- $$$xml-dom.tml-description -->
<div class="descr"> <a name="details"></a>
<a name="dom"></a><p>DOM Level 2 is a W3C Recommendation for XML interfaces that maps the constituents of an XML document to a tree structure. The specification of DOM Level 2 can be found at <a href="http://www.w3.org/DOM/">http://www.w3.org/DOM/</a>.</p>
<a name="domintro"></a><a name="introduction-to-dom"></a>
<h2>Introduction to DOM</h2>
<p>DOM provides an interface to access and change the content and structure of an XML file. It makes a hierarchical view of the document (a tree view). Thus -- in contrast to the SAX2 interface -- an object model of the document is resident in memory after parsing which makes manipulation easy.</p>
<p>All DOM nodes in the document tree are subclasses of <a href="qdomnode.html">QDomNode</a>. The document itself is represented as a <a href="qdomdocument.html">QDomDocument</a> object.</p>
<p>Here are the available node classes and their potential child classes:</p>
<ul>
<li><a href="qdomdocument.html">QDomDocument</a>: Possible children are<ul>
<li><a href="qdomelement.html">QDomElement</a> (at most one)</li>
<li><a href="qdomprocessinginstruction.html">QDomProcessingInstruction</a></li>
<li><a href="qdomcomment.html">QDomComment</a></li>
<li><a href="qdomdocumenttype.html">QDomDocumentType</a></li>
</ul>
</li>
<li><a href="qdomdocumentfragment.html">QDomDocumentFragment</a>: Possible children are<ul>
<li><a href="qdomelement.html">QDomElement</a></li>
<li><a href="qdomprocessinginstruction.html">QDomProcessingInstruction</a></li>
<li><a href="qdomcomment.html">QDomComment</a></li>
<li><a href="qdomtext.html">QDomText</a></li>
<li><a href="qdomcdatasection.html">QDomCDATASection</a></li>
<li><a href="qdomentityreference.html">QDomEntityReference</a></li>
</ul>
</li>
<li><a href="qdomdocumenttype.html">QDomDocumentType</a>: No children</li>
<li><a href="qdomentityreference.html">QDomEntityReference</a>: Possible children are<ul>
<li><a href="qdomelement.html">QDomElement</a></li>
<li><a href="qdomprocessinginstruction.html">QDomProcessingInstruction</a></li>
<li><a href="qdomcomment.html">QDomComment</a></li>
<li><a href="qdomtext.html">QDomText</a></li>
<li><a href="qdomcdatasection.html">QDomCDATASection</a></li>
<li><a href="qdomentityreference.html">QDomEntityReference</a></li>
</ul>
</li>
<li><a href="qdomelement.html">QDomElement</a>: Possible children are<ul>
<li><a href="qdomelement.html">QDomElement</a></li>
<li><a href="qdomtext.html">QDomText</a></li>
<li><a href="qdomcomment.html">QDomComment</a></li>
<li><a href="qdomprocessinginstruction.html">QDomProcessingInstruction</a></li>
<li><a href="qdomcdatasection.html">QDomCDATASection</a></li>
<li><a href="qdomentityreference.html">QDomEntityReference</a></li>
</ul>
</li>
<li><a href="qdomattr.html">QDomAttr</a>: Possible children are<ul>
<li><a href="qdomtext.html">QDomText</a></li>
<li><a href="qdomentityreference.html">QDomEntityReference</a></li>
</ul>
</li>
<li><a href="qdomprocessinginstruction.html">QDomProcessingInstruction</a>: No children</li>
<li><a href="qdomcomment.html">QDomComment</a>: No children</li>
<li><a href="qdomtext.html">QDomText</a>: No children</li>
<li><a href="qdomcdatasection.html">QDomCDATASection</a>: No children</li>
<li><a href="qdomentity.html">QDomEntity</a>: Possible children are<ul>
<li><a href="qdomelement.html">QDomElement</a></li>
<li><a href="qdomprocessinginstruction.html">QDomProcessingInstruction</a></li>
<li><a href="qdomcomment.html">QDomComment</a></li>
<li><a href="qdomtext.html">QDomText</a></li>
<li><a href="qdomcdatasection.html">QDomCDATASection</a></li>
<li><a href="qdomentityreference.html">QDomEntityReference</a></li>
</ul>
</li>
<li><a href="qdomnotation.html">QDomNotation</a>: No children</li>
</ul>
<p>With <a href="qdomnodelist.html">QDomNodeList</a> and <a href="qdomnamednodemap.html">QDomNamedNodeMap</a> two collection classes are provided: <a href="qdomnodelist.html">QDomNodeList</a> is a list of nodes, and <a href="qdomnamednodemap.html">QDomNamedNodeMap</a> is used to handle unordered sets of nodes (often used for attributes).</p>
<p>The <a href="qdomimplementation.html">QDomImplementation</a> class allows the user to query features of the DOM implementation.</p>
<p>To get started please refer to the <a href="qdomdocument.html">QDomDocument</a> documentation. You might also want to take a look at the <a href="xml-dombookmarks.html">DOM Bookmarks example</a>, which illustrates how to read and write an XML bookmark file (XBEL) using DOM.</p>
</div>
<!-- @@@xml-dom.tml -->
<p class="naviNextPrevious footerNavi">
<a class="prevPage" href="xml-sax.html">The SAX interface</a>
<a class="nextPage" href="xmlprocessing.html">XQuery/XPath and XML Schema</a>
</p>
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