问QXmlQuery和XSLT20:每次生成的输出字符串都是空的，在外壳(Xmlpattern)上运行良好

EN

ItunesLibParser::ItunesLibParser()
{
    pathToLib = QString("/Users/rakesh/temp/itunes_xslt/itunes_music_library.xml");
}

void ItunesLibParser::createXSLFile(QFile &inFile)
{
    if (inFile.exists()) {
        inFile.remove();
    }

    inFile.open(QIODevice::WriteOnly);
    QTextStream out(&inFile);

    out << QString("<?xml version=\"1.0\" encoding=\"ISO-8859-1\"?>");
    out << QString("<xsl:stylesheet version=\"2.0\" xmlns:xsl=\"http://www.w3.org/1999/XSL/Transform\">");
    out << QString("<xsl:output method=\"text\" />");


    out << QString("<xsl:template name=\"playlistNames\">");
    out << QString("<xsl:value-of select=\"child::integer[preceding-sibling::key[1]='Playlist ID']\"/>");
    out << QString("<xsl:text>&#xa;</xsl:text>");
    out << QString("<xsl:value-of select=\"child::string[preceding-sibling::key[1]='Name']\"/>");
    out << QString("<xsl:text>&#xa;</xsl:text>");
    out << QString("</xsl:template>");


    out << QString("<xsl:template match=\"/\">");
    out << QString("<xsl:for-each select=\"plist/dict/array/dict\">");
    out << QString("<xsl:call-template name=\"playlistNames\"/>");
    out << QString("</xsl:for-each>");
    out << QString("</xsl:template>");

    out << QString("</xsl:stylesheet>");

    inFile.close();

    return;

}

void ItunesLibParser::dumpPlayList()
{

    QXmlQuery query(QXmlQuery::XSLT20);
    query.setFocus(QUrl(pathToLib));

    QFile xslFile("plist.xsl");
    createXSLFile(xslFile);

    query.setQuery(QUrl("plist.xsl"));

    QStringList* outDump = new QStringList();

    query.evaluateTo(outDump);


    if(outDump != NULL) {

        QStringList::iterator iter = (*outDump).begin();
        for (; iter != (*outDump).end();
               ++iter)
            //code flow doesn't come here. It means being() == end()
            std::cout << (*iter).toLocal8Bit().constData() << std::endl;
    }

    return;
}