if (!angle) return NS_ERROR_DOM_SVG_WRONG_TYPE_ERR;
NS_IMETHODIMP nsSVGMarkerElement::SetOrientToAngle(nsIDOMSVGAngle *angle){  mOrientType->SetBaseVal(SVG_MARKER_ORIENT_ANGLE);  nsIDOMSVGAngle *a;  mOrientAngle->GetBaseVal(&a);  float f;  angle->GetValue(&f);  a->SetValue(f);  return NS_OK;}