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Having troubles with CXMLDocument parser in iOS

CXMLDocument *parser = [[[CXMLDocument alloc] initWithContentsOfURL:[NSURL URLWithString:[NSString stringWithFormat:@"http://free.worldweatheronline.com/feed/weather.ashx?q=%@&includeLocation=yes&format=xml&cc=no&date=2012-01-02&key=8adf0ef591225819113001", query]] options:0 error:nil] autorelease];

 

lowTemp           = [[[[[parser nodesForXPath:@"/data/weather/tempMinF" error:nil] objectAtIndex:0] attributeForName:@"data"] stringValue] integerValue];

       

<data>

<weather>

<tempMinF>4</tempMinF>

</weather>

</data>

       

<xml_api_reply version="1">

<weather module_id="0" tab_id="0" mobile_row="0" mobile_zipped="1" row="0" section="0">

<current_conditions>

<temp_f data="52"/>

</current_conditions>

</weather>

</xml_api_reply>