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<title>QXmlEntityResolver Class</title>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QXmlEntityResolver Class Reference<br><small>[<a href="xml.html">XML module</a>]</small></h1>
<p>The QXmlEntityResolver class provides an interface to
resolve external entities contained in XML data.
<a href="#details">More...</a>
<p>All the functions in this class are <a href="threads.html#reentrant">reentrant</a> when Qt is built with thread support.</p>
<p><tt>#include <<a href="qxml-h.html">qxml.h</a>></tt>
<p>Inherited by <a href="qxmldefaulthandler.html">QXmlDefaultHandler</a>.
<p><a href="qxmlentityresolver-members.html">List of all member functions.</a>
<h2>Public Members</h2>
<ul>
<li class=fn>virtual bool <a href="#resolveEntity"><b>resolveEntity</b></a> ( const QString & publicId, const QString & systemId, QXmlInputSource *& ret ) = 0</li>
<li class=fn>virtual QString <a href="#errorString"><b>errorString</b></a> () = 0</li>
</ul>
<hr><a name="details"></a><h2>Detailed Description</h2>
The QXmlEntityResolver class provides an interface to
resolve external entities contained in XML data.
<p>
<p> If an application needs to implement customized handling for
external entities, it must implement this interface, i.e.
<a href="#resolveEntity">resolveEntity</a>(), and register it with
<a href="qxmlreader.html#setEntityResolver">QXmlReader::setEntityResolver</a>().
<p> See also the <a href="xml.html#sax2Intro">Introduction to SAX2</a>.
<p> <p>See also <a href="qxmldtdhandler.html">QXmlDTDHandler</a>, <a href="qxmldeclhandler.html">QXmlDeclHandler</a>, <a href="qxmlcontenthandler.html">QXmlContentHandler</a>, <a href="qxmlerrorhandler.html">QXmlErrorHandler</a>, <a href="qxmllexicalhandler.html">QXmlLexicalHandler</a>, and <a href="xml-tools.html">XML</a>.
<hr><h2>Member Function Documentation</h2>
<h3 class=fn><a href="qstring.html">QString</a> <a name="errorString"></a>QXmlEntityResolver::errorString ()<tt> [pure virtual]</tt>
</h3>
<p> The reader calls this function to get an error string if any of
the handler functions returns FALSE.
<h3 class=fn>bool <a name="resolveEntity"></a>QXmlEntityResolver::resolveEntity ( const <a href="qstring.html">QString</a> & publicId, const <a href="qstring.html">QString</a> & systemId, <a href="qxmlinputsource.html">QXmlInputSource</a> *& ret )<tt> [pure virtual]</tt>
</h3>
<p> The reader calls this function before it opens any external
entity, except the top-level document entity. The application may
request the reader to resolve the entity itself (<em>ret</em> is 0) or
to use an entirely different input source (<em>ret</em> points to the
input source).
<p> The reader deletes the input source <em>ret</em> when it no longer needs
it, so you should allocate it on the heap with <tt>new</tt>.
<p> The argument <em>publicId</em> is the public identifier of the external
entity, <em>systemId</em> is the system identifier of the external
entity and <em>ret</em> is the return value of this function. If <em>ret</em>
is 0 the reader should resolve the entity itself, if it is
non-zero it must point to an input source which the reader uses
instead.
<p> If this function returns FALSE the reader stops parsing and
reports an error. The reader uses the function <a href="#errorString">errorString</a>() to
get the error message.
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