Item CommentConstructor::evaluateSingleton(const DynamicContext::Ptr &context) const
{
    const QString content(evaluateContent(context));
    const NodeBuilder::Ptr nodeBuilder(context->nodeBuilder(QUrl()));
    nodeBuilder->comment(content);

    const QAbstractXmlNodeModel::Ptr nm(nodeBuilder->builtDocument());
    context->addNodeModel(nm);

    return nm->root(QXmlNodeModelIndex());
}
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Item ProcessingInstructionConstructor::evaluateSingleton(const DynamicContext::Ptr &context) const
{
    const NodeBuilder::Ptr nodeBuilder(context->nodeBuilder(QUrl()));

    nodeBuilder->processingInstruction(evaluateTardata(context), data(context));

    const QAbstractXmlNodeModel::Ptr nm(nodeBuilder->builtDocument());
    context->addNodeModel(nm);

    return nm->root(QXmlNodeModelIndex());
}
Item AttributeConstructor::evaluateSingleton(const DynamicContext::Ptr &context) const
{
    const Item nameItem(m_operand1->evaluateSingleton(context));
    const Item content(m_operand2->evaluateSingleton(context));

    const QXmlName name(nameItem.as<QNameValue>()->qName());
    const QString value(processValue(name, content ? content.stringValue() : QString()));
    const NodeBuilder::Ptr nodeBuilder(context->nodeBuilder(QUrl()));

    nodeBuilder->attribute(name, QStringRef(&value));

    const QAbstractXmlNodeModel::Ptr nm(nodeBuilder->builtDocument());
    context->addNodeModel(nm);
    return nm->root(QXmlNodeModelIndex());
}
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Item DocumentConstructor::evaluateSingleton(const DynamicContext::Ptr &context) const
{
    NodeBuilder::Ptr nodeBuilder(context->nodeBuilder(m_staticBaseURI));

    DocumentContentValidator validator(nodeBuilder.data(), context, ConstPtr(this));
    const DynamicContext::Ptr receiverContext(context->createReceiverContext(&validator));

    validator.startDocument();
    m_operand->evaluateToSequenceReceiver(receiverContext);
    validator.endDocument();

    const QAbstractXmlNodeModel::Ptr nm(nodeBuilder->builtDocument());
    context->addNodeModel(nm);

    return nm->root(QXmlNodeModelIndex());
}
Item TextNodeConstructor::evaluateSingleton(const DynamicContext::Ptr &context) const
{
    const Item chars(m_operand->evaluateSingleton(context));

    if(!chars)
        return Item();

    const NodeBuilder::Ptr nodeBuilder(context->nodeBuilder(QUrl()));
    const QString &v = chars.stringValue();
    nodeBuilder->characters(QStringRef(&v));

    const QAbstractXmlNodeModel::Ptr nm(nodeBuilder->builtDocument());
    context->addNodeModel(nm);

    return nm->root(QXmlNodeModelIndex());
}
Item ElementConstructor::evaluateSingleton(const DynamicContext::Ptr &context) const
{
    const Item name(m_operand1->evaluateSingleton(context));

    const NodeBuilder::Ptr nodeBuilder(context->nodeBuilder(m_staticBaseURI));
    OutputValidator validator(nodeBuilder.data(), context, this, m_isXSLT);

    const DynamicContext::Ptr receiverContext(context->createReceiverContext(&validator));

    nodeBuilder->startElement(name.as<QNameValue>()->qName());
    m_operand2->evaluateToSequenceReceiver(receiverContext);
    nodeBuilder->endElement();

    const QAbstractXmlNodeModel::Ptr nm(nodeBuilder->builtDocument());
    context->addNodeModel(nm);

    return nm->root(QXmlNodeModelIndex());
}