                        default='https://raw.githubusercontent.com/Kitware/vtk-examples/gh-pages/src/Coverage/vtk_vtk-examples_xref.json',
                        help='The URL for the JSON cross-reference file.')
    parser.add_argument('-o', '--overwrite', action="store_true",
                        help='Force an initial download of the JSON cross-reference file.')

    args = parser.parse_args()
