Problem when using QGraphicsSvgItem

[NoRulez]

Hello,

i want to play a little bit with the svg functions, but i have several problems. I hope someone can clear this

1.) When drawing various types on the QGraphicsScene e.g QGraphicsRectitem, .... and save this as an svg file:

QSvgGenerator generator;
            generator.setFileName(file.fileName());
            generator.setSize(QSize(width+20, height+20));
 
            QPainter painter;
            painter.begin(&generator);
            scene()->render(&painter, QRectF(0, 0, width+10, height+10), QRectF(minX-10, minY-10, width+20, height+20));
            painter.end();

QSvgGenerator generator;
            generator.setFileName(file.fileName());
            generator.setSize(QSize(width+20, height+20));

            QPainter painter;
            painter.begin(&generator);
            scene()->render(&painter, QRectF(0, 0, width+10, height+10), QRectF(minX-10, minY-10, width+20, height+20));
            painter.end();

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how can i add element id's?
2.) When i load an existing svg file, how can i get a list of available element id's. Here i want do create a QGraphicsSvgItem for each element, so i can modify it in the graphicsscene.
3.) Is the way to draw svg graphics correct (Question 1)

Thanks in advance

Best Regards
NoRulez