{
  "name": "crs_to_authid",
  "type": "function",
  "groups": ["CRS"],
  "description": "Returns a user-friendly identifier for the CRS",
  "arguments": [{
    "arg": "crs",
    "description": "crs value"
  }],
  "examples": [{
    "expression": "crs_to_authid(crs_from_text('EPSG:3857'))",
    "returns": "'EPSG:3857'"
  }],
  "tags": ["crs", "epsg", "authid"]
}