Creating new XML file

[auba]

I have an other question about "valid XML":
is it possible to create a header line
<?xml version=\"1.0\" encoding=\"iso8859-1\" ?>"
by some calls of whatever or do I have to set them with

DomDocumentType doctype = impl.createDocumentType("name", QString::null, QString::null);
QDomDocument doc = impl.createDocument("uri", "name", doctype); 
doc.setContent(QString("<?xml version=\"1.0\" encoding=\"iso8859-1\" ?>"));

DomDocumentType doctype = impl.createDocumentType("name", QString::null, QString::null);
QDomDocument doc = impl.createDocument("uri", "name", doctype); 
doc.setContent(QString("<?xml version=\"1.0\" encoding=\"iso8859-1\" ?>"));

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Sorry, this piece of code is from Qt3. Until now I did not face the differences of XML code in Qt4.