code: public void reload(NiceXWPFDocument doc) {
  		try {
  			this.close();
  		} catch (IOException e) {
  		    logger.error("Close failed", e);
  		}
  		this.doc = doc;
  		this.eleTemplates = this.visitor.visitDocument(doc);
  	}
docs: 重新解析doc
  
  @param doc