OC3-xml文件解析

<?xml version="1.0"?>
<xml_api_reply version="1">
    <cities>
        <city>
            <name data="保定"/>
            <latitude_e6> 38849998</latitude_e6>
            <longitude_e6> 115569999</longitude_e6>
        </city>
        <city default="true" >
            <name data="北京"/>
            <latitude_e6> 39930000</latitude_e6>
            <longitude_e6> 116279998</longitude_e6>
        </city>
        <city>
            <name data="沈阳"/>
            <latitude_e6> 41770000</latitude_e6>
            <longitude_e6> 123430000</longitude_e6>
        </city>
        <city>
            <name data="成都"/>
            <latitude_e6> 30670000</latitude_e6>
            <longitude_e6> 104019996</longitude_e6>
        </city>
        <city>
            <name data="大连"/>
            <latitude_e6> 38900001</latitude_e6>
            <longitude_e6> 121629997</longitude_e6>
        </city>
        <city>
            <name data="福州"/>
            <latitude_e6> 26079999</latitude_e6>
            <longitude_e6> 119279998</longitude_e6>
        </city>
        <city>
            <name data="阜阳"/>
            <latitude_e6> 32930000</latitude_e6>
            <longitude_e6> 115830001</longitude_e6>
        </city>
        <city>
            <name data="赣州"/>
            <latitude_e6> 25850000</latitude_e6>
            <longitude_e6> 114949997</longitude_e6>
        </city>
        <city>
            <name data="广州"/>
            <latitude_e6> 23129999</latitude_e6>
            <longitude_e6> 113319999</longitude_e6>
        </city>
        <city>
            <name data="贵阳"/>
            <latitude_e6> 26579999</latitude_e6>
            <longitude_e6> 106720001</longitude_e6>
        </city>
        <city>
            <name data="哈尔滨"/>
            <latitude_e6> 45750000</latitude_e6>
            <longitude_e6> 126769996</longitude_e6>
        </city>
        <city>
            <name data="海口"/>
            <latitude_e6> 20030000</latitude_e6>
            <longitude_e6> 110349998</longitude_e6>
        </city>
        <city>
            <name data="邯郸"/>
            <latitude_e6> 38029998</latitude_e6>
            <longitude_e6> 114419998</longitude_e6>
        </city>
        <city>
            <name data="杭州"/>
            <latitude_e6> 30229999</latitude_e6>
            <longitude_e6> 120169998</longitude_e6>
        </city>
        <city>
            <name data="合肥"/>
            <latitude_e6> 31870000</latitude_e6>
            <longitude_e6> 117230003</longitude_e6>
        </city>
        <city>
            <name data="菏泽"/>
            <latitude_e6> 36119998</latitude_e6>
            <longitude_e6> 114370002</longitude_e6>
        </city>
        <city>
            <name data="衡阳"/>
            <latitude_e6> 36119998</latitude_e6>
            <longitude_e6> 114370002</longitude_e6>
        </city>
    </cities>
</xml_api_reply>

//
//  main.m
//  OC3-xml文件解析
//
//  Created by qianfeng on 15/6/25.
//  Copyright (c) 2015年 qianfeng. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "GDataXMLNode.h"
int main(int argc, const char * argv[]) {
    @autoreleasepool {
        NSData *xmlData =[NSData dataWithContentsOfFile:@"/Users/qianfeng/Desktop/text/text/untitled folder/内存管理/OC3-xml文件解析/citys.xml"];
        //创建docmentd对象
        GDataXMLDocument *xmlDocument =[[GDataXMLDocument alloc] initWithData:xmlData options:0 error:nil];
         GDataXMLElement *rootElement =[xmlDocument rootElement];
        //Xpath
        //相对路径:从当前节点计算的路径 用点表示当前节点 (当前路径为xml_api_reply下的节点)
        
        //绝对路径:从根节点计算的路径  /xml_api_reply/cities/city/name (绝对路径文件最前面要加'/')
        // NSArray *names = [rootElement nodesForXPath:@"/xml_api_reply/cities/city/name" error:nil];
        
        NSArray *names = [rootElement nodesForXPath:@"./cities/city/name" error:nil];
        for (GDataXMLElement *name in names) {
            NSString *nameString =[[name attributeForName:@"data"] stringValue];
            NSLog(@"name =%@",nameString);
        }
        
        
        NSArray *latitudes=[rootElement nodesForXPath:@"./cities/city" error:nil];
        for (GDataXMLElement *latitude in latitudes) {
            NSString *latitudeString =[[[latitude elementsForName:@"latitude_e6"] firstObject] stringValue];
            NSLog(@"latitude_e6 =%@",latitudeString);
        }
        
        NSLog(@"name =%@",names);
    }
    return 0;
}