qt-everywhere-src-5.15.1/qtxmlpatterns/tests/auto/xmlpatternssdk/docs/XMLWriterExample.cpp

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QByteArray result;
QBuffer returnBuffer(&result);
XMLWriter writer(&returnBuffer);

writer.startDocument();

writer.startDTD(QLatin1String("html"), QLatin1String("-//W3C//DTD XHTML 1.0 Strict//EN"),
                QLatin1String("http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"));
writer.endDTD();

writer.startPrefixMapping(QString(), QLatin1String("http://www.w3.org/1999/xhtml"));

writer.startElement(QLatin1String("html"), QXmlAttributes());
writer.startElement(QLatin1String("body"), QXmlAttributes());
writer.startElement(QLatin1String("p"), QXmlAttributes());

writer.characters(QLatin1String("Hello World!"));

writer.endElement(QLatin1String("p"));
writer.endElement(QLatin1String("body"));
writer.endElement(QLatin1String("html"));

writer.endDocument();