// create a QDomDocument object QDomDocument doc; QString errorMessage; int errorLine, errorColumn; if (!doc.setContent(xmlString, &errorMessage, &errorLine, &errorColumn)) { qWarning() << "Failed to parse XML: " << errorMessage << "at line " << errorLine << ", column " << errorColumn; return; } QDomElement element = doc.documentElement(); qDebug() << "Namespace URI: " << element.namespaceURI();
// create a QDomDocument object QDomDocument doc; QString errorMessage; int errorLine, errorColumn; if (!doc.setContent(xmlString, &errorMessage, &errorLine, &errorColumn)) { qWarning() << "Failed to parse XML: " << errorMessage << "at line " << errorLine << ", column " << errorColumn; return; } QString nsURI = "http://example.com/ns"; QDomNodeList elements = doc.elementsByTagNameNS(nsURI, "element"); for (int i = 0; i < elements.size(); i++) { QDomElement element = elements.at(i).toElement(); qDebug() << "Element: " << element.tagName(); }This example demonstrates how to find all the elements with a specific namespace URI in an XML document. The QDomDocument::elementsByTagNameNS() method returns a QDomNodeList object that contains all the elements with the given namespace URI and tag name. Then, we loop through the list and use the toElement() method to convert each QDomNode object to a QDomElement object. Finally, we can access the properties of the element, such as its tag name, using the QDomElement API. Both examples use the QDomElement namespaceURI property to get the namespace URI of an element. The package library for the QDomElement namespace is the Qt XML module, which is a part of the Qt framework.