code: def _extract_header_value(line):
      
  
      # Skip blank lines, returning None
      if not line:
          return None
  
      # Attempt to split by equals sign
      halves = line.split('=')
      if len(halves) > 1:
          key = halves[0].strip()
          value = halves[1].strip()
          return {key: value}
  
      # Otherwise, attempt to split by colon
      else:
          halves = line.split(':')
          key = halves[0].strip()
          value = halves[1].strip()
          return {key: value}
docs: Extracts a key / value pair from a header line in an ODF file