code: def parse_gml(lines, label="label", destringizer=None):
      """Parse GML graph from a string or iterable.
  
      Parameters
      ----------
      lines : string or iterable of strings
         Data in GML format.
  
      label : string, optional
          If not None, the parsed nodes will be renamed according to node
          attributes indicated by `label`. Default value: 'label'.
  
      destringizer : callable, optional
          A `destringizer` that recovers values stored as strings in GML. If it
          cannot convert a string to a value, a `ValueError` is raised. Default
          value : None.
  
      Returns
      -------
      G : NetworkX graph
          The parsed graph.
  
      Raises
      ------
      NetworkXError
          If the input cannot be parsed.
  
      See Also
      --------
      write_gml, read_gml
  
      Notes
      -----
      This stores nested GML attributes as dictionaries in the NetworkX graph,
      node, and edge attribute structures.
  
      GML files are stored using a 7-bit ASCII encoding with any extended
      ASCII characters (iso8859-1) appearing as HTML character entities.
      Without specifying a `stringizer`/`destringizer`, the code is capable of
      writing `int`/`float`/`str`/`dict`/`list` data as required by the GML
      specification.  For writing other data types, and for reading data other
      than `str` you need to explicitly supply a `stringizer`/`destringizer`.
  
      For additional documentation on the GML file format, please see the
      `GML url <https://web.archive.org/web/20190207140002/http://www.fim.uni-passau.de/index.php?id=17297&L=1>`_.
  
      See the module docstring :mod:`networkx.readwrite.gml` for more details.
      """
  
      def decode_line(line):
          if isinstance(line, bytes):
              try:
                  line.decode("ascii")
              except UnicodeDecodeError as err:
                  raise NetworkXError(
                      "input is not ASCII-encoded"
                  ) from err
          if not isinstance(line, str):
              line = str(line)
          return line
  
      def filter_lines(lines):
          if isinstance(lines, str):
              lines = decode_line(lines)
              lines = lines.splitlines()
              yield from lines
          else:
              for line in lines:
                  line = decode_line(line)
                  if line and line[-1] == "\n":
                      line = line[:-1]
                  if line.find("\n") != -1:
                      raise NetworkXError("input line contains newline")
                  yield line
  
      G = parse_gml_lines(filter_lines(lines), label, destringizer)
      return G
  
imports: import html.entities
  import re
  import warnings
  from ast import literal_eval
  from collections import defaultdict
  from enum import Enum
  from io import StringIO
  from typing import Any, NamedTuple
  import networkx
  from networkx.exception import NetworkXError
  from networkx.utils import open_file
label_desc: Use image node_id 5 for calling a global function with example usage: parse_gml(lines, label, destringizer) and returns: G, line