code: def _is_composed_key(field):
      return HIER_SEPARATOR in field
  
file_path: nltk/nltk/twitter/common.py
imports: import csv
  import gzip
  import json
  from nltk.internals import deprecated
label_desc: Use image node_id 3 for calling a global function with example usage: _is_composed_key(field) and returns: unknown