code: def id_record(rec):
      """Converts a record's id to a blank node id and returns the record."""
      rec["id"] = f"_:f{rec['id']}"
      return rec
  
file_path: Fiona/fiona/fio/helpers.py
imports: from functools import partial
  import json
  import math
  import warnings
  from fiona.model import Geometry, to_dict
  from fiona._vendor.munch import munchify
label_desc: Use image node_id 5 for calling a global function with example usage: id_record(rec) and returns: rec