#includeIn this example, we're loading an XML document and accessing the root element using the QDomDocument and QDomElement classes. We then call the lastChild() function on the root element to get the last child element, and convert it to a QDomElement using the toElement() function. We also make sure to check if the last child element is null before using it. The package library in this example is the Qt core library, which provides the QDomElement class for working with XML documents.QDomDocument doc; // ... load and parse XML document QDomElement root = doc.documentElement(); QDomElement lastChild = root.lastChild().toElement(); if (!lastChild.isNull()) { // do something with the last child element }