bool XbelTree::read(QIODevice *device)
{
    QString errorStr;
    int errorLine;
    int errorColumn;

    if (!domDocument.setContent(device, true, &errorStr, &errorLine,
                                &errorColumn)) {
        QMessageBox::information(window(), tr("DOM Bookmarks"),
                                 tr("Parse error at line %1, column %2:\n%3")
                                 .arg(errorLine)
                                 .arg(errorColumn)
                                 .arg(errorStr));
        return false;
    }

    QDomElement docElem;
    QDomNodeList lstNodes(domDocument.elementsByTagName("page"));
        for (int n=0; n<lstNodes.count(); n++)
        {
            QDomElement childElem = lstNodes.at(n).toElement();
            if (childElem.attribute("id") == "page01")
            {
                QDomElement child = childElem.lastChild().toElement();
                qDebug() << child.text();
            }
        }

    return true;
}

<?xml version="1.0" encoding="UTF-8"?>
<help>
    <page id = "page01">
        <title>title of page01</title>
        <message>text1</message>
    </page>
    <page id = "page99">
        <title>title of page99</title>
        <message>text2</message>
    </page>
</help>

    QDomElement root = domDocument.documentElement();
    QDomElement child = root.firstChildElement("page");
    while (!child.isNull()) {
        if (child.attribute("id") == "page01") {
            QDomElement message = child.firstChildElement("message");
            qDebug() << child.text();
        }
        child = child.nextSiblingElement("page");
    }

    QString pageid = QString::number(currentId());

    QDomDocument domDocument;
    QDomElement root = domDocument.documentElement();
    QDomElement help = root.firstChildElement("help");
    QDomElement child = help.firstChildElement("page");
    while (!child.isNull())
    {
        if (child.attribute("id") == pageid)
        {
            QDomElement mess = child.firstChildElement("message");
            message = mess.text();
            //message = pageid;
        }
        child = child.nextSiblingElement("page");
    }

<?xml version="1.0" ?>
<!-- Help data -->
<help>
    <page id="0">
        <title>title0</title>
        <message>message0</message>
    </page>
    <page id="1">
        <title>title1</title>
        <message><![CDATA[message1]]></message>
    </page>
</help>

void ExpertSystem::showHelp()
{
    static QString lastHelpMessage;

    QString message;
    QDomDocument doc;
    QFile file("/home/opensuse/qt/expertsystem/help.xml");
    if (!file.exists())
    {
        QMessageBox::warning(this, QObject::trUtf8("Предупреждение"), QObject::trUtf8("Ошибка 001. Файл help.xml не существует"));
    }
    if (!file.open(QIODevice::ReadOnly))
    {
        QMessageBox::warning(this, QObject::trUtf8("Предупреждение"), QObject::trUtf8("Ошибка 002. Невозможно открыть файл help.xml"));
        return;
    }
    if (!doc.setContent(&file))
    {
        QMessageBox::warning(this, QObject::trUtf8("Предупреждение"), QObject::trUtf8("Ошибка 003. Невозможно прочитать файл help.xml"));
        file.close();
        return;
    }
    doc.setContent(&file);

    QString pageid = QString::number(currentId());

    QDomDocument domDocument;
    QDomElement root = domDocument.documentElement();
    QDomElement help = root.firstChildElement("help");
    QDomElement child = help.firstChildElement("page");
    while (!child.isNull())
    {
        if (child.attribute("id") == pageid)
        {
            QDomElement mess = child.firstChildElement("message");
            message = mess.text();
            //message = pageid;
        }
        child = child.nextSiblingElement("page");
    }
    file.close();

    //if (lastHelpMessage == message)
    //    message = tr("");

    QMessageBox::information(this, QObject::trUtf8("Подсказка"), message);

    lastHelpMessage = message;
}