{
  "name": "make_circle",
  "type": "function",
  "description": "Creates a circular polygon.",
  "variableLenArguments": true,
  "arguments": [
    {"arg":"center", "description": "center point of the circle"},
    {"arg":"radius", "description": "radius of the circle"},
    {"arg":"segment", "optional": true, "default": "36", "description": "optional argument for polygon segmentation. By default this value is 36"}
  ],
  "examples": [
    { "expression":"geom_to_wkt(make_circle(make_point(10,10), 5, 4))", "returns":"'Polygon ((10 15, 15 10, 10 5, 5 10, 10 15))'"},
    { "expression":"geom_to_wkt(make_circle(make_point(10,10,5), 5, 4))", "returns":"'PolygonZ ((10 15 5, 15 10 5, 10 5 5, 5 10 5, 10 15 5))'"},
    { "expression":"geom_to_wkt(make_circle(make_point(10,10,5,30), 5, 4))", "returns":"'PolygonZM ((10 15 5 30, 15 10 5 30, 10 5 5 30, 5 10 5 30, 10 15 5 30))'"}
  ]
}