class QString;
class QByteArray;
class QFont;
+class QGraphicsItem;
class GraphicsScene;
class Reader;
virtual bool setAttribute(QString const& name, QString const& value) = 0;
virtual void addToScene(GraphicsScene* scene) = 0;
virtual void update() = 0;
+ virtual QGraphicsItem* getElement() const = 0;
QString const& getError() const;
protected: