[
  {
    "type": "Point",
    "coordinates": [
      100.0,
      0.0
    ],
    "extra": "foo"
  },
  {
    "type": "Feature",
    "id": "f2",
    "geometry": {
      "type": "LineString",
      "coordinates": [
        [
          100.0,
          0.0
        ],
        [
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        ]
      ]
    },
    "properties": {
      "foo": "bar"
    },
    "centerline": {
      "type": "LineString",
      "coordinates": [
        [
          -170,
          10
        ],
        [
          170,
          11
        ]
      ]
    }
  },
  {
    "type": "FeatureCollection",
    "features": [
      {
        "type": "Feature",
        "geometry": {
          "type": "Point",
          "coordinates": [
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          ]
        },
        "properties": {
          "prop0": "value0"
        }
      }
    ],
    "extra": {
      "bar": "baz"
    }
  }
]