TouchXML - reading only certain elements

Question

Hey everyone,

So I have an XML file and am using TouchXML to read it. There are only some elements in the XML file that I require. So I created a class 'Contact' with properties that I wish to save from the XML file. What i've come up with so far is this:

NSMutableArray *res = [[NSMutableArray alloc] init]; 
    CXMLDocument *doc = [[[CXMLDocument alloc] initWithData:data options:0 error:nil] autorelease]; 
    NSArray *nodes = nil; 

    //! searching for item nodes 
    nodes = [doc nodesForXPath:@"/statuses/status/user" error:nil]; 


    for (CXMLElement *node in nodes) 
    { 
        int counter; 

        Contact *contact  = [[Contact alloc] init]; 
        for (counter = 0; counter < [node childCount]; counter++) 
        { 
            //pulling out name and description only for the minute!!!
            if ([[[node childAtIndex:counter] name] isEqual:@"name"]){

                contact.name = [[node childAtIndex:counter] stringValue];

            }else if ([[[node childAtIndex:counter] name] isEqual:@"description"]) {

                // common procedure: dictionary with keys/values from XML node 
                if ([[node childAtIndex:counter] stringValue] == NULL){
                    contact.nextAction = @"No description";
                }else{
                    contact.nextAction = [[node childAtIndex:counter] stringValue];
                }

            }else if ([[[node childAtIndex:counter] name] isEqual:@"created_at"]){
                NSString *str = [[NSString alloc] init];
                str = [[node childAtIndex:counter] stringValue];
                contact.date = str;
                [str release];
            }else if([[[node childAtIndex:counter] name] isEqual:@"time_zone"]){

                contact.status = [[node childAtIndex:counter] stringValue];
                [res addObject:contact];
                [contact release];
            }
        } 
    }
    self.contactsArray = res;
    [res release];
    [self.tableView reloadData];

However I have some concerns... I'm not to sure about the creation of the object and its release... I think it might be causing me memory problems but I've tried a few different ways of doing this and haven't been able to find a solution. Can somebody tell me if what i'm doing is completely wrong? or is there another/better way of doing it.

The error I'm getting from Memory allocation is:

OnePageCRM(55776,0xa03ef720) malloc: * error for object 0x3cac070: double free * set a breakpoint in malloc_error_break to debug

Thanks in advance, Fiona