XML文件：
<?xml version="1.0" encoding="utf-8" ?>
<Root>
<country name="中国" id="1001">
<province name="广东" id="1001001">
<city name="深圳" id="1001001001"></city>
<city name="广州" id="1001001002"></city>
<city name="珠海" id="1001001003"></city>
<city name="东莞" id="1001001004"></city>
</province>