{
  "name": "file_exists",
  "type": "function",
  "groups": ["Files and Paths"],
  "description": "Returns true if a file path exists.",
  "arguments": [ {"arg":"path","description":"a file path"}],
  "examples": [ { "expression":"file_exists('/home/qgis/data/country_boundaries.shp')", "returns":"true"}]
}