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@GDataXMLNode是Google提供的用于XML数据处理的类集。该类集对libxml2-DOM处理方式进行了封装,能对较小或中等的XML文档进行读写操作且支持XPath语法。
1.http://code.google.com/p/gdata-objectivec-client/source/browse/trunk/Source/XMLSupport/,获得GDataXMLNode.h和GDataXMLNode.m文件,进行如下操作将文件导入到Xcode的工程中:
2.将GDataXMLNode.h/m文件添加到工程中;
3.向工程中增加“libxml2.dylib”库;
4.在工程的“Build Settings”页中找到“Header Search Path”项,添加“/usr/include/libxml2”到其路径
5.搜索框中搜索Other linker flags,同样的方式添加-lxml2
@代码示例:
首先在工程中新建一个xml文件,作为我们要解析的对象,新建方法是在工程中新建一个Empty的文件,命名为Student.txt(可以命名为.xml,这个随意),然后添加内容:
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<?xml version="1.0" encoding="UTF-8"?>
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<Students class="17班" school="中国">
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<student>
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<number>1</number>
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<name>胡明涛</name>
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<sex>男</sex>
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<phone>123558</phone>
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</student>
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<student>
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<number>2</number>
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<name>成风采</name>
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<sex>男</sex>
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<phone>122323</phone>
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</student>
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<student>
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<number>3</number>
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<name>陈咬金</name>
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<sex>男</sex>
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<phone>21313558</phone>
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</student>
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<student sign="非应届生">
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<number>4</number>
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<name>天天下</name>
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<sex>男</sex>
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<phone>56453558</phone>
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</student>
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</Students>
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#pragma mark - GDataXMLNode
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- (void)onClickGDataXMLButton{
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// 获取工程目录的xml文件
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NSData * xmlData = [NSData dataWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"Student" ofType:@"txt"]];
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// 从文档中读出完整的XML数据,在内存中形成完整的树形结构
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NSError * error = nil;
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GDataXMLDocument * documents = [[GDataXMLDocument alloc]initWithData:xmlData options:0 error:&error];
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// 取得根节点(element元素)---Students
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GDataXMLElement * rootEL = [documents rootElement];
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// 获取根节点下的节点,返回的数组---student
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NSArray * studentsArray = [rootEL elementsForName:@"student"];
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for (int i = 0; i < [studentsArray count]; i++) {
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// 获取单个节点对象
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GDataXMLElement * student = [studentsArray objectAtIndex:i];
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// 获取student节点下name,number,sex,phone节点的值
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GDataXMLElement * nameElement = [[student elementsForName:@"name"] lastObject];
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GDataXMLElement * sexElement = [[student elementsForName:@"sex"]lastObject];
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GDataXMLElement * numberElement = [[student elementsForName:@"number"]lastObject];
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GDataXMLElement * phoneElement = [[student elementsForName:@"phone"]lastObject];
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NSString * name = [nameElement stringValue];
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NSString * number = [numberElement stringValue];
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NSString * sex = [sexElement stringValue];
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NSString * phone = [phoneElement stringValue];
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// 读标签里面的属性(attributeForName)
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NSString * sign = [[student attributeForName:@"sign"]stringValue];
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if (sign) {
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NSLog(@"----------%@",sign);
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}
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NSLog(@"%@,%@,%@,%@",number,name,sex,phone);
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}
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#pragma mark 通过路径,取得指定的节点值,所有节点中同一标签的值
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// 一个是相对路径,一个是绝对路径-----------(nodesForXPath)
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//NSArray * nameArray = [rootEL nodesForXPath:@"//name" error:nil];
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NSArray * nameArray = [rootEL nodesForXPath:@"student/name" error:nil];
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for (int i = 0; i < [nameArray count]; i++) {
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NSString * name = [[nameArray objectAtIndex:i] stringValue];
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NSLog(@"---%@",name);
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}
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}
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<?xml version="1.0"?>
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<xml_api_reply version="1">
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<cities>
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<city>
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<name data="保定"/>
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<latitude_e6> 38849998</latitude_e6>
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<longitude_e6> 115569999</longitude_e6>
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</city>
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<city default="true" >
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<name data="北京"/>
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<latitude_e6> 39930000</latitude_e6>
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<longitude_e6> 116279998</longitude_e6>
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</city>
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<city>
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<name data="沈阳"/>
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<latitude_e6> 41770000</latitude_e6>
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<longitude_e6> 123430000</longitude_e6>
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</city>
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<city>
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<name data="成都"/>
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<latitude_e6> 30670000</latitude_e6>
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<longitude_e6> 104019996</longitude_e6>
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</city>
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<city>
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<name data="大连"/>
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<latitude_e6> 38900001</latitude_e6>
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<longitude_e6> 121629997</longitude_e6>
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</city>
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<city>
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<name data="福州"/>
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<latitude_e6> 26079999</latitude_e6>
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<longitude_e6> 119279998</longitude_e6>
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</city>
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<city>
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<name data="阜阳"/>
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<latitude_e6> 32930000</latitude_e6>
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<longitude_e6> 115830001</longitude_e6>
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</city>
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<city>
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<name data="赣州"/>
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<latitude_e6> 25850000</latitude_e6>
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<longitude_e6> 114949997</longitude_e6>
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</city>
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<city>
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<name data="广州"/>
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<latitude_e6> 23129999</latitude_e6>
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<longitude_e6> 113319999</longitude_e6>
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</city>
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<city>
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<name data="贵阳"/>
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<latitude_e6> 26579999</latitude_e6>
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<longitude_e6> 106720001</longitude_e6>
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</city>
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<city>
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<name data="哈尔滨"/>
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<latitude_e6> 45750000</latitude_e6>
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<longitude_e6> 126769996</longitude_e6>
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</city>
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<city>
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<name data="海口"/>
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<latitude_e6> 20030000</latitude_e6>
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<longitude_e6> 110349998</longitude_e6>
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</city>
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<city>
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<name data="邯郸"/>
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<latitude_e6> 38029998</latitude_e6>
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<longitude_e6> 114419998</longitude_e6>
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</city>
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<city>
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<name data="杭州"/>
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<latitude_e6> 30229999</latitude_e6>
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<longitude_e6> 120169998</longitude_e6>
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</city>
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<city>
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<name data="合肥"/>
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<latitude_e6> 31870000</latitude_e6>
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<longitude_e6> 117230003</longitude_e6>
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</city>
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<city>
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<name data="菏泽"/>
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<latitude_e6> 36119998</latitude_e6>
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<longitude_e6> 114370002</longitude_e6>
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</city>
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<city>
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<name data="衡阳"/>
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<latitude_e6> 36119998</latitude_e6>
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<longitude_e6> 114370002</longitude_e6>
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</city>
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</cities>
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</xml_api_reply>
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#pragma mark - 解析citys
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- (void)parseCitys{
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NSData * xmlCitysData = [NSData dataWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"citys" ofType:@"xml"]];
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// 从文档中读取完成的XML文档,在内存中形成完整的树形结构
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NSError * error = nil;
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GDataXMLDocument * documents = [[GDataXMLDocument alloc]initWithData:xmlCitysData options:0 error:&error];
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// 取得根节点
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GDataXMLElement * rootNode = [documents rootElement];
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#pragma mark 获取根节点xml_api_reply的数组,包含的是cities
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NSArray * citiesArray = [rootNode elementsForName:@"cities"];
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for (int i = 0; i < [citiesArray count]; i++) {
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// 取得单个cities节点
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GDataXMLElement * cities = [citiesArray objectAtIndex:i];
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#pragma mark 获取节点cities的数组,包含的是city
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NSArray * cityArray = [cities elementsForName:@"city"];
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for (int j = 0; j < [cityArray count]; j++) {
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// 取得单个city节点
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GDataXMLElement * city = [cityArray objectAtIndex:j];
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#pragma mark city节点下面是3个并行的节点,都是1个,直接通过lastObject来取得想要的值
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NSString * name = [[[[city elementsForName:@"name"]lastObject] attributeForName:@"data"] stringValue];
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NSLog(@"name = %@",name);
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NSString * latitude_e6 = [[[city elementsForName:@"latitude_e6"]lastObject] stringValue];
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NSLog(@"latitude_e6 = %@",latitude_e6);
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NSString * longitude_e6 = [[[city elementsForName:@"longitude_e6"]lastObject] stringValue];
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NSLog(@"longitude_e6 = %@",longitude_e6);
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}
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}
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}
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