GeoJson file to test https://github.com/sciamlab/gson-viewer

rome.geojson

{
  "type": "Feature",
  "properties": {
    "comune": {
      "id": "H501",
      "denominazione": "Roma",
      "uri": "https://data.sciamlab.com/api/entilocali/v1/comune/h501"
    }
  },
  "geometry": {
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}