{
  "$schema": "urn:prism:schema:v1:spec",
  "title": "World map (natural earth)",
  "data": {"feature_collection": {"tier": "world-110m"}},
  "mark": "geoshape",
  "projection": {"type": "naturalearth"},
  "encoding": {
    "feature": {"field": "id", "type": "nominal"}
  }
}