{
  "name": "x",
  "type": "function",
  "groups": ["GeometryGroup"],
  "description": "Returns the x coordinate of a point geometry, or the x coordinate of the centroid for a non-point geometry.",
  "arguments": [ {"arg":"geometry","description":"a geometry"}],
  "examples": [ { "expression":"x( geom_from_wkt( 'POINT(2 5)' ) )", "returns":"2"},
  { "expression":"x( $geometry )", "returns":"x coordinate of the current feature's centroid"}
  ]
}