@Override
	public String toDocument(){
		if( content == null || content.equals("")){
			return "";
		}
		String dom ="<msg ";
		dom += "WxId="+getWxId() +" SendTime="+getSendTime() + " MsgType="+getMsgType() + " >\n";;
		dom += content +"\n";
		
		return dom;
	}