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problems displaying a nodeValue

Parsing an XML file and I can't seem to retrieve the -nodeValue of anything(however I have successfully before in other code). Why is this code broken?
            DOMNode * dataNode;
            DOMElement * dataElement;
            DOMNodeList * parseRenderImplChildren = [parseRenderImplNode childNodes];
            NSLog(@"parseRenderImplChildren %d", [parseRenderImplChildren length]);
            // get data node
            for(i = 0 ; i < [parseRenderImplChildren length] ; i++)
            {
                if([[[parseRenderImplChildren item:i] nodeName] isEqualToString:@"data"])
                {
                    dataNode = [parseRenderImplChildren item:i];
                    dataElement = (DOMElement *)dataNode;
                    break;
                }
            }


            NSLog(@"[dataNode nodeValue] %@", [dataNode nodeValue]);

the output to this is:

2005-10-04 11:00:57.661 BHRG[22223] parseRenderImplChildren 3
2005-10-04 11:00:57.661 BHRG[22223] [dataNode nodeValue]

BHRG has exited due to signal 11 (SIGSEGV).
on
    <parse-render-impl xml:lang="en">
        <data fieldmarker="^">
            <parse> ....
            </parse>
            <render> ....
            </render>
        </data>
--
Michael Hanna
iChat: michaelkhanna(AIM)
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