How validate with qt a xml file with xsd file which imports another xsd file?

I use this code to validate my foo.xml

QFile* fileXsd = new QFile("D:\\...\\fooValidator.xsd");
if (!fileXsd->open(QIODevice::ReadOnly | QIODevice::Text))
    qWarning() << QObject::tr("Couldn't open xsd file.");    
QXmlSchema schema;
schema.load(fileXsd);
if(schema.isValid()) 
{
    QFile* fileXml = new QFile("D:\\...\\foo.xml");
    if (!fileXml->open(QIODevice::ReadOnly | QIODevice::Text))
        qWarning() << QObject::tr("Couldn't open xml file.");
    QXmlSchemaValidator validator(schema);
    if(!validator.validate(fileXml, QUrl::fromLocalFile(fileXml->fileName())))
        qCritical() << "instance document is invalid";
    else
    {
        //Ok
    }
 }

My file fooValidator.xsd imports types from a file fooTypeValidator.xsd.

fooValidator.xsd, fooTypeValidator.xsd and foo.xml are correct (I verrified with xmlvalidation)

When I run my program, I get an error ; the type declared in fooTypeValidator.xsd cannot be resolved.

fooTypeValidator.xsd is not imported by QXmlSchema nor by QXmlSchemaValidator