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<li>Qt 5.3</li>
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Qt 5.3.2 Reference Documentation</li>
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<li class="level1"><a href="#public-types">Public Types</a></li>
<li class="level1"><a href="#public-functions">Public Functions</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
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<h1 class="title">QXmlItem Class</h1>
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<p>The QXmlItem class contains either an XML node or an atomic value. <a href="#details">More...</a></p>
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<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign"> </b><tt><span class="preprocessor">#include <QXmlItem></span>
</tt></td></tr><tr><td class="memItemLeft rightAlign topAlign"> qmake:</td><td class="memItemRight bottomAlign"> <tt>QT += xmlpatterns</tt></td></tr><tr><td class="memItemLeft rightAlign topAlign"> Since:</td><td class="memItemRight bottomAlign"> Qt 4.4</td></tr></table><p><b>Note:</b> All functions in this class are reentrant.</p>
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<li><a href="qxmlitem-members.html">List of all members, including inherited members</a></li>
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<a name="public-types"></a>
<h2>Public Types</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> typedef </td><td class="memItemRight bottomAlign"><b><a href="qxmlitem.html#Iterator-typedef">Iterator</a></b></td></tr>
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<h2>Public Functions</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qxmlitem.html#QXmlItem">QXmlItem</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qxmlitem.html#QXmlItem-2">QXmlItem</a></b>(const QXmlItem &<i> other</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qxmlitem.html#QXmlItem-3">QXmlItem</a></b>(const QXmlNodeModelIndex &<i> node</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qxmlitem.html#QXmlItem-4">QXmlItem</a></b>(const QVariant &<i> atomicValue</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qxmlitem.html#dtor.QXmlItem">~QXmlItem</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qxmlitem.html#isAtomicValue">isAtomicValue</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qxmlitem.html#isNode">isNode</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qxmlitem.html#isNull">isNull</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QVariant </td><td class="memItemRight bottomAlign"><b><a href="qxmlitem.html#toAtomicValue">toAtomicValue</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QXmlNodeModelIndex </td><td class="memItemRight bottomAlign"><b><a href="qxmlitem.html#toNodeModelIndex">toNodeModelIndex</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QXmlItem & </td><td class="memItemRight bottomAlign"><b><a href="qxmlitem.html#operator-eq">operator=</a></b>(const QXmlItem &<i> other</i>)</td></tr>
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<h2>Detailed Description</h2>
<p>The QXmlItem class contains either an XML node or an atomic value.</p>
<p>In <a href="xmlprocessing.html">XQuery</a>, all expressions evaluate to a sequence of items, where each item is either an XML node or an atomic value. The query in the following snippet evaluates to sequence of five items.</p>
<pre class="cpp"><aNode/>,
xs:base64Binary("FFFF"),
current-date(),
3e3, (: A floating point value :)
attribute {"name"} {()}</pre>
<p>The five items are: An element, an atomic value (binary data encoded in base64), a date, a float, and an attribute.</p>
<p>QXmlItem is the class that represents these <a href="xmlprocessing.html">XQuery</a> items in the Qt XML Patterns API. A non-null instance of QXmlItem is either a node or an atomic value. Calling <a href="qxmlitem.html#isNode">isNode</a>() or <a href="qxmlitem.html#isAtomicValue">isAtomicValue</a>() tells you which it is. Atomic values are represented elsewhere in the Qt API as instances of QVariant, and an instance of QXmlItem that represents an atomic value can be converted to a QVariant by calling <a href="qxmlitem.html#toAtomicValue">toAtomicValue</a>(). A QXmlItem that wraps a node is represented elsewhere as an instance of <a href="qxmlnodemodelindex.html">QXmlNodeModelIndex</a>. A node QXmlItem can be converted to a <a href="qxmlnodemodelindex.html">QXmlNodeModelIndex</a> by calling <a href="qxmlitem.html#toNodeModelIndex">toNodeModelIndex</a>().</p>
<p>A default constructed QXmlItem instance is neither a node nor an atomic value. It is considered null, in which case <a href="qxmlitem.html#isNull">isNull</a>() returns true.</p>
<p>An instance of QXmlItem will be left dangling if the <a href="qabstractxmlnodemodel.html">XML node model</a> it refers to is deleted, if it is a <a href="qxmlnodemodelindex.html">QXmlNodeModelIndex</a>.</p>
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<h2>Member Type Documentation</h2>
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<h3 class="fn"><a name="Iterator-typedef"></a>typedef QXmlItem::<span class="name">Iterator</span></h3>
<p>A QAbstractXmlForwardIterator over <a href="qxmlitem.html">QXmlItem</a>.</p>
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<h2>Member Function Documentation</h2>
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<h3 class="fn"><a name="QXmlItem"></a>QXmlItem::<span class="name">QXmlItem</span>()</h3>
<p>Constructs a null <a href="qxmlitem.html">QXmlItem</a> that is neither a node nor an atomic value. <a href="qxmlitem.html#isNull">isNull</a>() returns true for a default constructed instance.</p>
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<h3 class="fn"><a name="QXmlItem-2"></a>QXmlItem::<span class="name">QXmlItem</span>(const <span class="type">QXmlItem</span> &<i> other</i>)</h3>
<p>The copy constructor constructs a copy of <i>other</i>.</p>
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<h3 class="fn"><a name="QXmlItem-3"></a>QXmlItem::<span class="name">QXmlItem</span>(const <span class="type"><a href="qxmlnodemodelindex.html">QXmlNodeModelIndex</a></span> &<i> node</i>)</h3>
<p>Constructs a node <a href="qxmlitem.html">QXmlItem</a> that is a copy of <i>node</i>.</p>
<p><b>See also </b><a href="qxmlitem.html#isNode">isNode</a>().</p>
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<h3 class="fn"><a name="QXmlItem-4"></a>QXmlItem::<span class="name">QXmlItem</span>(const <span class="type">QVariant</span> &<i> atomicValue</i>)</h3>
<p>Constructs an atomic value <a href="qxmlitem.html">QXmlItem</a> with <i>atomicValue</i>.</p>
<p><b>See also </b><a href="qxmlitem.html#isAtomicValue">isAtomicValue</a>().</p>
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<h3 class="fn"><a name="dtor.QXmlItem"></a>QXmlItem::<span class="name">~QXmlItem</span>()</h3>
<p>Destructor.</p>
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<h3 class="fn"><a name="isAtomicValue"></a><span class="type">bool</span> QXmlItem::<span class="name">isAtomicValue</span>() const</h3>
<p>Returns true if this item is an atomic value. Returns false if it is a node or null.</p>
<p><b>See also </b><a href="qxmlitem.html#isNull">isNull</a>() and <a href="qxmlitem.html#isNode">isNode</a>().</p>
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<h3 class="fn"><a name="isNode"></a><span class="type">bool</span> QXmlItem::<span class="name">isNode</span>() const</h3>
<p>Returns true if this item is a Node. Returns false if it is an atomic value or null.</p>
<p><b>See also </b><a href="qxmlitem.html#isNull">isNull</a>() and <a href="qxmlitem.html#isAtomicValue">isAtomicValue</a>().</p>
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<h3 class="fn"><a name="isNull"></a><span class="type">bool</span> QXmlItem::<span class="name">isNull</span>() const</h3>
<p>Returns true if this <a href="qxmlitem.html">QXmlItem</a> is neither a node nor an atomic value. Default constructed instances of <a href="qxmlitem.html">QXmlItem</a> are null.</p>
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<h3 class="fn"><a name="toAtomicValue"></a><span class="type">QVariant</span> QXmlItem::<span class="name">toAtomicValue</span>() const</h3>
<p>If this <a href="qxmlitem.html">QXmlItem</a> represents an atomic value, it is converted to an appropriate QVariant and returned. If this <a href="qxmlitem.html">QXmlItem</a> is not an atomic value, the return value is a default constructed QVariant. You can call <a href="qxmlitem.html#isAtomicValue">isAtomicValue</a>() to test whether the item is an atomic value.</p>
<p><b>See also </b><a href="qxmlitem.html#isAtomicValue">isAtomicValue</a>().</p>
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<h3 class="fn"><a name="toNodeModelIndex"></a><span class="type"><a href="qxmlnodemodelindex.html">QXmlNodeModelIndex</a></span> QXmlItem::<span class="name">toNodeModelIndex</span>() const</h3>
<p>If this <a href="qxmlitem.html">QXmlItem</a> represents a node, it returns the item as a <a href="qxmlnodemodelindex.html">QXmlNodeModelIndex</a>. If this <a href="qxmlitem.html">QXmlItem</a> is not a node, the return value is undefined. You can call <a href="qxmlitem.html#isNode">isNode</a>() to test whether the item is a node.</p>
<p><b>See also </b><a href="qxmlitem.html#isNode">isNode</a>().</p>
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<h3 class="fn"><a name="operator-eq"></a><span class="type">QXmlItem</span> & QXmlItem::<span class="name">operator=</span>(const <span class="type">QXmlItem</span> &<i> other</i>)</h3>
<p>Assigns <i>other</i> to <tt>this</tt>.</p>
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