imp = e;
if (imp != null) { while (imp.hasMoreElements()) { UMLElement element = (UMLElement) imp.nextElement(); element.accept(v); } }
if (imp != null) return (UMLElement) imp.nextElement(); else return null;
if (imp != null) return imp.hasMoreElements(); else return false;
if (imp != null) return imp.nextElement(); else return null;