TBXML - Error Handling

- (void)viewDidLoad {

    TBXML * tbxml = [[TBXML tbxmlWithURL:[NSURL URLWithString:@"http://localhost/dev/mcomm/produto.xml"]] retain];
    TBXMLElement * rootXMLElement = tbxml.rootXMLElement;


}

TBXML *tbxml = nil;
@try {
    tbxml = [[TBXML tbxmlWithURL:[NSURL URLWithString:@"http://localhost/dev/mcomm/produto.xml"]] retain];;
}
@catch (NSException *exception) {
    NSLog(@"Caught %@: %@", [exception name], [exception reason]);
}

TBXMLElement * xmlElement = aParentXMLElement->firstChild;

if (aParentXMLElement != nil) {
    TBXMLElement * xmlElement = aParentXMLElement->firstChild;
} else {
    NSLog(@"Can't proceed: aParentXMLElement is nil");
}