Example of polyline before the materials property was implemented?

CesiumJS
1

How were polylines specified with czml before the materials property was implemented? We are restricted to using cesium b28 and the following polyline is not rendered at all...

{
    "id": "test-5",
    "polyline": {
        "positions": {
            "cartographicDegrees": [
                173,
                44,
                0,
                173.5,
                44.5,
                0,
                174,
                44,
                0
            ]
        },
        "width": 7,
        "color": {
            "rgba": [
                255,
                42,
                0,
                255
            ]
        }
    }
}

Can someone please let me know what the issue might be?

Thank you,