[SOLVED] unable to parse xml using touchXML, nodesForXPath return nothing

I am trying to parse xml using the touchXML library but not getting the results, the code is as below

NSError *error = nil;    
CXMLDocument *xmlParser = [[CXMLDocument alloc] initWithXMLString:dataString options:0 error:&error];

NSArray *resultNodes = NULL;
resultNodes = [xmlParser nodesForXPath:@"//entry" error:&error];

for (CXMLElement *resultElement in resultNodes) {
    NSMutableDictionary *blogItem = [[NSMutableDictionary alloc] init];

    int counter;

    for(counter = 0; counter < [resultElement childCount]; counter++) {
        [blogItem setObject:[[resultElement childAtIndex:counter] stringValue] forKey:[[resultElement childAtIndex:counter] name]];
    }        
}

the method nodesForXPath: doesn't returns anything leaving the resultNodes array with 0 objects. I am getting the proper xml in dataString and the CXMLDocument is also getting prepared properly. I tried debugging it but there is nothing I can see accept the 0 objects in resultNodes, NSError also contains nothing (i.e. no error occurs). the xml file I am trying to parse is as below.

<feed xmlns:s="http://syndication.nhschoices.nhs.uk/services" xmlns="http://www.w3.org/2005/Atom">
<title type="text">...</title>
<id>...</id>
<rights type="text">© Crown Copyright 2009</rights>
<updated>2012-04-27T11:33:02+01:00</updated>
<category term="Search"/>
<logo>...</logo>
<author>...</author>
<s:SearchCoords>174900,517900</s:SearchCoords>
<entry>
    <id>
        http://v1.syndication.nhschoices.nhs.uk/organisations/gppractices/32248
    </id>
    <title type="text">Sayer A</title>
    <updated>2012-04-27T10:33:02Z</updated>
    <link rel="self" title="Sayer A" href="http://v1.syndication.nhschoices.nhs.uk/organisations/gppractices/32248?apikey=YAHUGHET"/>
    <link rel="alternate" title="Sayer A" href="http://www.nhs.uk/ServiceDirectories/Pages/GP.aspx?pid=15F37AEF-EC5B-4A90-9E72-269ADEB39629"/>
    <content type="application/xml">
        <s:organisationSummary>
            <s:name>Sayer A</s:name>
            <s:address>
                <s:addressLine>The Richmond Green Medical Cen</s:addressLine>
                <s:addressLine>19 The Green</s:addressLine>
                <s:addressLine>Richmond</s:addressLine>
                <s:addressLine>Surrey</s:addressLine>
                <s:postcode>TW91PX</s:postcode>
            </s:address>
            <s:contact type="General">
                <s:telephone>020 83327515</s:telephone>
            </s:contact>
            <s:geographicCoordinates>
                <s:northing>174900</s:northing>
                <s:easting>517800</s:easting>
                <s:longitude>-0.305512266736965</s:longitude>
                <s:latitude>51.4608026642546</s:latitude>
            </s:geographicCoordinates>
            <s:Distance>0.1</s:Distance>
        </s:organisationSummary>
    </content>
</entry>
<entry>
    <id>
        http://v1.syndication.nhschoices.nhs.uk/organisations/gppractices/33420
    </id>
    <title type="text">Griffiths W</title>
    <updated>2012-04-27T10:33:02Z</updated>
    <link rel="self" title="Griffiths W" href="http://v1.syndication.nhschoices.nhs.uk/organisations/gppractices/33420?apikey=YAHUGHET"/>
    <link rel="alternate" title="Griffiths W" href="http://www.nhs.uk/ServiceDirectories/Pages/GP.aspx?pid=EEC98A8A-B888-4F44-A0B6-DC6ABCBF19CE"/>
    <content type="application/xml">
        <s:organisationSummary>
            <s:name>Griffiths W</s:name>
            <s:address>
                <s:addressLine>Paradise Road Surgery</s:addressLine>
                <s:addressLine>37 Paradise Road</s:addressLine>
                <s:addressLine>Richmond</s:addressLine>
                <s:addressLine>Surrey</s:addressLine>
                <s:postcode>TW91SA</s:postcode>
            </s:address>
            <s:contact type="General">
                <s:telephone>020 89402423</s:telephone>
            </s:contact>
            <s:geographicCoordinates>
                <s:northing>174800</s:northing>
                <s:easting>518100</s:easting>
                <s:longitude>-0.301388352909701</s:longitude>
                <s:latitude>51.4601120315006</s:latitude>
            </s:geographicCoordinates>
            <s:Distance>0.223606797749979</s:Distance>
        </s:organisationSummary>
    </content>
</entry>
<entry>
    <id>
        http://v1.syndication.nhschoices.nhs.uk/organisations/gppractices/33035
    </id>
    <title type="text">Dr Da Costa</title>
    <updated>2012-04-27T10:33:02Z</updated>
    <link rel="self" title="Dr Da Costa" href="http://v1.syndication.nhschoices.nhs.uk/organisations/gppractices/33035?apikey=YAHUGHET"/>
    <link rel="alternate" title="Dr Da Costa" href="http://www.nhs.uk/ServiceDirectories/Pages/GP.aspx?pid=EDCE215D-6412-4AAB-AFC4-9F37888D413C"/>
    <content type="application/xml">
        <s:organisationSummary>
            <s:name>Dr Da Costa</s:name>
            <s:address>
                <s:addressLine>The Vineyard Surgery</s:addressLine>
                <s:addressLine>35 The Vineyard</s:addressLine>
                <s:addressLine>Richmond</s:addressLine>
                <s:addressLine>Surrey</s:addressLine>
                <s:postcode>TW106PP</s:postcode>
            </s:address>
            <s:contact type="General">
                <s:telephone>020 89480404</s:telephone>
            </s:contact>
            <s:geographicCoordinates>
                <s:northing>174600</s:northing>
                <s:easting>518100</s:easting>
                <s:longitude>-0.301044685875553</s:longitude>
                <s:latitude>51.4581333717098</s:latitude>
            </s:geographicCoordinates>
            <s:Distance>0.360555127546399</s:Distance>
        </s:organisationSummary>
    </content>
</entry>