code: private void convertHTMLCode(ArrayList<ArrayList<TextPiece>> wordsByPage) {
  	DocInfo docInfo = new DocInfo();
  	String[] html2Char = docInfo.getHtml2CharMapping(); // Only define this
  							    // mapping string
  							    // when we detect
  							    // the files in HTML
  							    // codes
  	int pageNum = 0;
  
  	for (ArrayList<TextPiece> wordsOfAPage : wordsByPage) {
  	    pageNum++;
  	    for (int i = 0; i < wordsOfAPage.size(); i++) {
  		TextPiece currentWord = wordsOfAPage.get(i);
  		String realText = "";
  		String textinHTMLCode = currentWord.getText();
  
  	    }
  	}
      }
docs: TODO: NOT finished yet Converts HTML code back to the real characters;
  
  @param wordsByPage
  the extracted texts in the word level in a document