def __init__(self, parent=None):
        QtGui.QGraphicsScene.__init__(self, parent)
        self.sceneBoundingRect = QtCore.QRectF()
        self.multiSelecting = False
validate option combination of Parameter object
dataset/ETHPy150Open VisTrails/VisTrails/vistrails/gui/graphics_view.py/QInteractiveGraphicsScene.__init__--crossover with--dataset/ETHPy150Open mission-liao/pyswagger/pyswagger/scanner/v1_2/validate.py/Validate._validate_param