code: def get_scheme_files(patterns=None):
      
      patterns = patterns or ['*']
      pattern_list = ['{}.yaml'.format(pattern) for pattern in patterns]
      scheme_files = []
      for scheme_path in get_scheme_dirs():
          for pattern in pattern_list:
              file_paths = glob(os.path.join(scheme_path, pattern))
              scheme_files.extend(file_paths)
  
      return scheme_files
docs: Return a list of all (or those matching $pattern) yaml (scheme)
      files.