-- 发布时间：8/10/2005 9:57:00 AM
-- 怎么通过属性查询xml
<root>
<p_node province="北京">
<c_item city="北京" post_code="100000" area_code="010">zxl</c_item>
<c_item city="通县" post_code="101100" area_code="010"/>
<c_item city="昌平" post_code="102200" area_code="010"/>
<c_item city="大兴" post_code="102600" area_code="010"/>
<c_item city="密云" post_code="101500" area_code="010"/>
<c_item city="延庆" post_code="102100" area_code="010"/>
<c_item city="顺义" post_code="101300" area_code="010"/>
<c_item city="怀柔" post_code="101400" area_code="010"/>
<c_item city="平台" post_code="101200" area_code="010"/>
</p_node>
<p_node province="上海">
<c_item city="上海" post_code="200000" area_code="021"/>
<c_item city="上海县" post_code="201100" area_code="021"/>
<c_item city="嘉定" post_code="201800" area_code="021"/>
<c_item city="松江" post_code="201600" area_code="021"/>
<c_item city="南汇" post_code="201300" area_code="021"/>
<c_item city="奉贤" post_code="201400" area_code="021"/>
<c_item city="川沙" post_code="201200" area_code="021"/>
<c_item city="青浦" post_code="201700" area_code="021"/>
<c_item city="崇明" post_code="202100" area_code="021"/>
<c_item city="金山" post_code="201500" area_code="021"/>
</p_node>
<root>
我想通过查”地址“查询出区号和长途号，该怎么办呢，反之通过区号和长途号查询出地址。大哥们帮帮我呀！好郁闷呢
