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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Qt Toolkit - The Qt DOM classes</title><style type="text/css"><!--
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<h1 align=center> The Qt DOM classes</h1><br clear="all">
<p>
<h2><a name="introDOM">Introduction to DOM</a></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 (tree)
available with the root element of the XML file serving as its root.
Thus -- in contrast to the SAX2 interface -- an object model of the document
is resident in memory after parsing which makes manipulation easy.
<p>
In the Qt implementation of the DOM all
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>
The following table lists the available node classes and
their potential children classes.
<table>
<tr>
<th align="left">Node type</th>
<th align="left">Possible children</th>
</tr>
<tr>
<td><a href="qdomdocument.html">QDomDocument</a> </td>
<td><a href="qdomelement.html">QDomElement</a> (maximum one), <a href="qdomprocessinginstruction.html">QDomProcessingInstruction</a>,
<a href="qdomcomment.html">QDomComment</a>, <a href="qdomdocumenttype.html">QDomDocumentType</a> </td>
</tr>
<tr>
<td><a href="qdomdocumentfragment.html">QDomDocumentFragment</a> </td>
<td><a href="qdomelement.html">QDomElement</a>, <a href="qdomprocessinginstruction.html">QDomProcessingInstruction</a>, <a href="qdomcomment.html">QDomComment</a>,
<a href="qdomtext.html">QDomText</a>, <a href="qdomcdatasection.html">QDomCDATASection</a>, <a href="qdomentityreference.html">QDomEntityReference</a> </td>
</tr>
<tr><td><a href="qdomdocumenttype.html">QDomDocumentType</a> </td>
<td>no children </td>
</tr>
<tr><td><a href="qdomentityreference.html">QDomEntityReference</a> </td>
<td><a href="qdomelement.html">QDomElement</a>, <a href="qdomprocessinginstruction.html">QDomProcessingInstruction</a>, <a href="qdomcomment.html">QDomComment</a>,
<a href="qdomtext.html">QDomText</a>, <a href="qdomcdatasection.html">QDomCDATASection</a>, <a href="qdomentityreference.html">QDomEntityReference</a> </td>
</tr>
<tr><td><a href="qdomelement.html">QDomElement</a> </td>
<td><a href="qdomelement.html">QDomElement</a>, <a href="qdomtext.html">QDomText</a>, <a href="qdomcomment.html">QDomComment</a>,
<a href="qdomprocessinginstruction.html">QDomProcessingInstruction</a>, <a href="qdomcdatasection.html">QDomCDATASection</a>,
<a href="qdomentityreference.html">QDomEntityReference</a> </td>
</tr>
<tr><td><a href="qdomattr.html">QDomAttr</a> </td>
<td><a href="qdomtext.html">QDomText</a>, <a href="qdomentityreference.html">QDomEntityReference</a> </td>
</tr>
<tr><td><a href="qdomprocessinginstruction.html">QDomProcessingInstruction</a> </td>
<td>no children </td>
</tr>
<tr><td><a href="qdomcomment.html">QDomComment</a> </td>
<td>no children </td>
</tr>
<tr><td><a href="qdomtext.html">QDomText</a> </td>
<td>no children </td>
</tr>
<tr><td><a href="qdomcdatasection.html">QDomCDATASection</a> </td>
<td>no children </td>
</tr>
<tr><td><a href="qdomentity.html">QDomEntity</a> </td>
<td><a href="qdomelement.html">QDomElement</a>, <a href="qdomprocessinginstruction.html">QDomProcessingInstruction</a>, <a href="qdomcomment.html">QDomComment</a>,
<a href="qdomtext.html">QDomText</a>, <a href="qdomcdatasection.html">QDomCDATASection</a>, <a href="qdomentityreference.html">QDomEntityReference</a> </td>
</tr>
<tr><td><a href="qdomnotation.html">QDomNotation</a> </td>
<td>no children </td>
</tr>
</table>
<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
whereas <a href="qdomnamednodemap.html">QDomNamedNodeMap</a> is used to handle unordered sets of nodes
(often used for attributes).
<p>
The <a href="qdomimplementation.html">QDomImplementation</a> class allows the user to query features of the
DOM implementation.
<p>
<h2>Further reading</h2>
<p>
To get started please refer to the <a href="qdomdocument.html">QDomDocument</a> documentation that
describes basic usage.
<p>
More information about Qt and XML
can be found in the <a href="xml.html">introduction to the Qt XML module.</a>
<p><address><hr><div align="center">
<table width="100%" cellspacing="0" border="0"><tr>
<td>Copyright 2000 Trolltech<td><a href="http://www.trolltech.com/trademarks.html">Trademarks</a>
<td align="right"><div align="right">Qt version 2.3.1</div>
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