{
  "name": "difference",
  "type": "function",
  "groups": ["GeometryGroup"],
  "description": "Returns a geometry that represents that part of geometry_a that does not intersect with geometry_b.",
  "arguments": [ {"arg":"geometry_a","description":"a geometry"},
                 {"arg":"geometry_b","description":"a geometry"}],
  "examples": [ { "expression":"geom_to_wkt( difference( geom_from_wkt( 'LINESTRING(3 3, 4 4, 5 5)' ), geom_from_wkt( 'LINESTRING(3 3, 4 4)' ) ) )", "returns":"LINESTRING(4 4, 5 5)"} ]
}