{
  "name": "centroid",
  "type": "function",
  "groups": ["GeometryGroup"],
  "description": "Returns the geometric center of a geometry.",
  "arguments": [{
    "arg": "geometry",
    "description": "a geometry"
  }],
  "examples": [{
    "expression": "centroid(@geometry)",
    "returns": "a point geometry"
  }],
  "tags": ["geometric", "center"]
}