{
  "name": "line_substring",
  "type": "function",
  "groups": ["GeometryGroup"],
  "description": "Returns the portion of a line (or curve) geometry which falls between the specified start and end distances (measured from the beginning of the line). Z and M values are linearly interpolated from existing values.",
  "arguments": [{
    "arg": "geometry",
    "description": "a linestring or curve geometry"
  }, {
    "arg": "start_distance",
    "description": "distance to start of substring"
  }, {
    "arg": "end_distance",
    "description": "distance to end of substring"
  }],
  "examples": [{
    "expression": "geom_to_wkt(line_substring(geometry:=geom_from_wkt('LineString(0 0, 10 0)'),start_distance:=2,end_distance:=6))",
    "returns": "'LineString (2 0,6 0)'"
  }],
  "tags": ["curve", "start", "specified", "measured", "falls", "existing", "interpolated", "beginning", "distances", "line", "end", "portion"]
}