Writing XML files with XmlDataAccess

I try to save my data in a XMLfile using bb/data/XmlDataAccess. The problem: It somehow refuses to take my data.

I tried it with

QVariantMap innitMate;
innitMate["id"] = QVariant(1);
xData.save(innitMate,"data/1.xml");

and with

QVariantMap innitMate;
innitMate["id"] = 1;
xData.save(innitMate,"data/1.xml");

In both cases,

QVariantMap temp = xData.load("data/1.xml").value<QVariantMap>();
qDebug()<<temp["id"].toString();

is just ""

what am i doing wrong?

Best regards