code: public List < CobolDataItem > toModel(final Reader cobolReader)
              throws RecognizerException {
          return emitModel(parse(lex(clean(cobolReader))));
      }
docs: Parses a COBOL source into an in-memory model.
  
  @param cobolReader reads the raw COBOL source
  @return a list of root COBOL data items
  @throws RecognizerException if COBOL recognition fails